Childcare Centre, Kindergarten, Preschool, Family Day Care, OSHC & Child Health Centre Accreditation HVAC Ductwork Guide

A note on scope and intent

This guide is the accreditation-depth companion to the SBKJ Childcare Centre, Kindergarten and OSHC HVAC Ductwork Guide. Where the earlier guide covered the core engineering brief at a working consultant level — AS 1668.2 ventilation, BCA Class 9b, NQS Quality Area 3, sleep room acoustics and nappy change exhaust — this guide goes deeper into the accreditation framework itself. The seven ACECQA quality areas, the federal Child Care Subsidy and the Education and Care Services National Law Act 2010 form the regulatory floor of every approved service in Australia, and they translate into engineering decisions far beyond the immediate occupancy calculation. The same is true for family day care residences (a fundamentally different building classification from a centre), for OSHC rooms operating inside primary schools, and for co-located child and maternal health clinics that import an entire Class 9a healthcare obligation into the brief.

Written from the SBKJ engineering office in Box Hill North, Victoria, this guide reflects the working consultant pattern across the major Australian operators — G8 Education ASX:GEM with its 480-plus centres across World of Learning, Caring Hands, Sandcastles, Headstart, Bambinos, Penguin, Buggles, First Grammar and Pelican brands; Goodstart Early Learning's 700-plus not-for-profit network funded by the Australian Future Children's Fund; Bright Horizons Australia at the US private-equity-backed premium end of the market; the legacy Affinity Education portfolio of 240-plus centres absorbed into KKR and Quadrant ownership in 2024; the OSHC market leaders Camp Australia and Junior Adventures Group; the not-for-profit and faith-based operators KU Children's Services, Gowrie network across NSW VIC SA WA TAS, Big Fat Smile in the Illawarra, C&K Catholic and Catholic Education Centres, the various Catholic dioceses operating centres, The Mission Australia, Save the Children Australia, Uniting Care Childcare, Anglicare Sydney VIC QLD, Bumble Bee Early Learning and Story House Early Learning; the premium private operators Only About Children and Petit Early Learning Journey; and the impact-investor and Indigenous-owned operators Future Super and Indigenous Business Australia. It addresses the family day care peak body Family Day Care Australia and the Outside School Hours Council Australia (OSHCA) coordination layer. It addresses the child and maternal health clinic operators — NSW Health Child and Family Health Service, Karitane and Tresillian in NSW, the Royal Children's Hospital Melbourne parent-baby unit, the Royal Hospital for Women Sydney and the state child health networks — that increasingly co-locate with childcare in integrated family centres. And it addresses the EPC and tier-one construction layer — Lendlease PPP early learning, John Holland Education, Built, Multiplex, Hutchinson Builders, DOMA Group in Canberra, Hesperia in Western Australia, the various Anglicare and Catholic-affiliated builders — who deliver the new facilities the federal Free Kinder reform and state expansion programmes have funded.

The Australian Childcare Alliance (ACA) and the Early Childhood Education and Care Federation (ECEC) provide industry peak coordination; the Australian Community Children's Services (ACCS) and Community Child Care Cooperative represent not-for-profit and community-managed services; the Department of Education and Workplace Relations federal layer administers the Child Care Subsidy (CCS), Family Tax Benefit interactions and Return to Work (RTW) Insurance and Carer Allowance interactions that frame parental affordability. None of those bodies writes mechanical specifications, but each shapes the operating environment that the HVAC system has to serve.

1. The Australian regulatory stack — the layered framework for early childhood HVAC

An Australian early childhood education and care service operates under a layered regulatory framework that intersects building code, Australian Standards, federal child-care law, state education law, quality assessment under the National Quality Framework, federal funding programmes and worker safety. The HVAC ductwork specification must satisfy every layer of that stack in a single coordinated design. The framework in priority order:

• National Construction Code (NCC) Volume One and Building Code of Australia (BCA). Childcare centres, kindergartens, preschools and OSHC rooms operating inside primary schools are typically Class 9b assembly. Family day care residences are Class 1a domestic. Sick child isolation rooms, lactation rooms, bottle preparation rooms and co-located child and maternal health clinic consult rooms are Class 9a healthcare. Centre kitchens, refrigerated meal storage, allergen-free preparation zones and laundries are Class 6 retail food. Office, admin, staff room and director's office are Class 5. Plant rooms are Class 7b ancillary. The classification governs fire compartmentation, smoke management, mechanical ventilation, exit provisions, lift requirements and accessibility under the Disability (Access to Premises — Buildings) Standards 2010.
• AS 1668.2 — Mechanical ventilation in buildings. Prescribes 12 L/s per person of outdoor air for childcare-classified spaces with progressive operator uplift to 15 L/s per person for toddler, kinder, preschool and OSHC rooms. Sets the 25 L/s minimum nappy change extract requirement. Sets kitchen and laundry extract rates. Section 5 contaminant exhaust applies to the sluice room handling nappy disposal, the sick child isolation room, the centre kitchen grease-laden vapour exhaust and the bottle preparation steriliser extract.
• AS 1668.1 — Fire and smoke control of duct penetrations. Required wherever ductwork penetrates fire-rated separations — between kitchen and learning rooms, between sick child isolation and corridor, between any Class 9b assembly and a Class 9a healthcare wing.
• AS 4254 — Ductwork construction. Part 1 flexible duct, Part 2 rigid duct. Pressure classes, seam construction, support spacing and sheet-thickness tables apply to all duct in the building.
• AS 1530.4 — Fire-resistance tests for structural elements. Referenced for any fire-rated duct enclosure passing through fire compartments.
• AS 4072 and AS 4072.3 — Fire damper installation. The Australian Standard for fire damper installation, including AS 4072.3 specifically for ventilation duct system fire dampers. Drop-test annually under the essential safety measures schedule.
• AS 4214 — Gaseous fire suppression systems. Rare in childcare and only relevant where the centre includes a chemistry science kit room (uncommon, found only in larger integrated family centres or preschools with science programmes).
• AS 2118 — Automatic fire sprinkler systems. Required for centres above the BCA threshold — rare in single-storey centres, common in multi-storey integrated family centres.
• AS 1670 — Fire detection, warning, control and intercom systems. Smoke detection, occupant warning and alarm systems coordinated with the HVAC fire and smoke damper strategy. ACECQA does not write fire detection standards but operational expectations on parent notification align with AS 1670 audible warning provisions.
• AS 1851 — Routine service of fire protection systems and equipment. Mandates the maintenance schedule for fire dampers, smoke dampers, motorised dampers and ducted smoke detection systems — required for ongoing essential safety measures compliance under the building's occupation certificate.
• AS 2107 — Acoustics — Recommended design sound levels and reverberation times for building interiors and AS 1276 — Acoustics — Method for the determination of sound transmission class. Set NC 35 in active learning rooms and NC 25 in sleep rooms. Increasingly measured by acoustic consultants at NQS rating visits as objective evidence of physical environment compliance.
• ASHRAE Standard 62.1 — Ventilation for acceptable indoor air quality. Used in conjunction with AS 1668.2 to validate outdoor air rates and to underpin the post-COVID continuous CO2 monitoring requirement at less than 1000 ppm in the classroom. ASHRAE 62.1 has been updated significantly post-pandemic toward more conservative outdoor air positions; many international operators (Bright Horizons, Only About Children) reference both AS 1668.2 and ASHRAE 62.1 with the higher rate governing.
• AS 1428.1 — Design for access and mobility. Applies under the Disability (Access to Premises — Buildings) Standards 2010. Supply and return grille height accessible to educators with disabilities, tactile and auditory signalling not interfered with by AHU noise, controls accessible to wheelchair users.
• AS 1735 — Lifts. Applies to multi-storey integrated family centres. Lift shaft pressurisation under AS 1668.1 where required for smoke control.
• AS/NZS 60079 — Explosive atmospheres. Zone 2 hazardous area classification around the LPG kitchen burner inlet and gas bullet area — the only place in a typical childcare centre where flammable atmosphere classification applies. Drives spark-resistant fan and duct selection in that zone.
• AS 1940 — Storage and handling of flammable and combustible liquids. Applies to centre cleaning chemical storage where any flammable or combustible solvent is held.
• Safe Work Australia Workplace Exposure Standards. CO2 5000 ppm TWA (with classroom target at less than 1000 ppm an order of magnitude below); formaldehyde 1 ppm STEL (laminated MDF furniture and toy off-gassing in newly fitted-out rooms); general VOC; respirable dust 10 mg/m³; chlorine 0.5 ppm STEL (pool-adjacent centres and nappy disinfection); peracetic acid 0.4 ppm STEL (Sterrad and Steris nappy and surface sanitation); ozone 0.1 ppm TWA (UV sanitation devices and laser printer ozone); cat allergen Fel d 1 and dog allergen Can f 1 (centres allowing visiting therapy dog or therapy cat under early intervention or pet-therapy programmes); methane 1.25 percent LEL (LPG kitchen gas leak ceiling).

Layered above this technical standards stack is the federal and state regulatory framework governing the operation of approved early childhood services:

• Education and Care Services National Law Act 2010. The mirror legislation enacted in each state that creates the National Quality Framework and governs all approved early childhood education and care services in Australia. Administered by ACECQA (the Australian Children's Education and Care Quality Authority) as the federal coordinator and by state regulators as the on-the-ground inspectorate.
• Education and Care Services National Regulations. The operational regulations made under the National Law, harmonised across all states and territories since 2012:
  • NSW Education and Care Services National Regulations 2011 administered by the NSW Department of Education.
  • VIC Education and Care Services National Regulations 2011 administered by the Victorian Department of Education.
  • QLD Education and Care Services Regulation administered by Queensland Department of Education.
  • WA Education and Care Services National Regulations administered by the WA Department of Communities.
  • SA Education and Care Services Regulations administered by the SA Education Standards Board.
  • TAS Education and Care Services National Regulations administered by the Tasmanian Department of Education.
  • ACT Education and Care Services Regulation administered by ACT Education Directorate.
  • NT Education and Care Services Regulation administered by the NT Department of Education.
• National Quality Standard (NQS). The seven quality areas published by ACECQA and assessed at rating visits by authorised officers from the state regulators. Discussed in depth in Section 2.
• National Quality Framework (NQF). The overarching framework binding the National Law, the National Regulations, the NQS and ACECQA together.
• Early Years Learning Framework (EYLF) — Belonging, Being, Becoming. The pedagogical framework for children aged 0 to 5 years adopted by all approved services. Translates into HVAC engineering through the room layout it implies — flexible diffuser placement that does not preclude reading corners, dramatic play tents, sensory mats and outdoor-indoor transition.
• Child Care Subsidy (CCS). The federal subsidy administered by the Department of Education and the Department of Social Services that underwrites parental affordability of approved services. CCS-approved status requires the service to operate under the National Law and NQS. CCS does not directly write HVAC specifications but ties operational viability to NQS rating outcomes.
• Family Tax Benefit and RTW Carer Allowance. Federal income-support measures that interact with CCS to support family use of approved services.
• Child Safe Standards arising from the Royal Commission into Institutional Responses to Child Sexual Abuse 2017 recommendations. Each state now has Child Safe Standards (in Victoria from 2017, in NSW from 2022, similarly across other states) that require organisations including childcare services to demonstrate physical and procedural safety arrangements. The HVAC engineering effect is the visibility and accessibility requirements for plant rooms, the locked-cupboard treatment of chemical storage spaces, and the line-of-sight from corridors and educator workstations into all child-occupied spaces.

Finally the industry peak bodies provide operational guidance that consultants reference: the Australian Childcare Alliance (ACA), the Early Childhood Education and Care Federation (ECEC), the Australian Community Children's Services (ACCS), Community Child Care Cooperative, Family Day Care Australia (FDC peak), the Outside School Hours Council Australia (OSHCA), and the operator-specific facility briefs published by G8 Education, Goodstart, Bright Horizons, Only About Children, Petit Early Learning Journey and the others. None of these bodies writes mechanical specifications, but their operational expectations feed into the consultant brief and the post-occupation evaluation that determines whether the centre maintains its NQS rating tier.

2. The seven ACECQA National Quality Standard quality areas — the accreditation depth

The National Quality Standard administered by ACECQA contains seven quality areas, each containing several standards and elements. Authorised officers from the state regulators assess every approved service against the seven quality areas at rating visits, awarding a rating of Significant Improvement Required, Working Towards NQS, Meeting NQS, Exceeding NQS or Excellent across each area and overall. The rating outcome affects parent enrolment behaviour, operator brand reputation and in many cases the rate of Child Care Subsidy parent affordability. The HVAC ductwork specification touches all seven quality areas, although the weight on each varies.

Quality Area 1 — Educational program and practice

Quality Area 1 asks how the service educational programme is informed by the Early Years Learning Framework (EYLF), how it is documented and shared with families, and how educators reflect on practice. The HVAC engineering effect is indirect but real: the room layout the EYLF implies — flexible reading corners, dramatic play tents, sensory mats, outdoor-indoor transition — constrains the supply diffuser placement. Linear slot diffusers along the room perimeter throwing across the room (rather than directly down) preserve flexibility because the rugs, mats and play tents can be repositioned as the programme requires. A point-source four-way diffuser in the centre of the room locks the rug layout to its current geometry and constrains future programming.

The same logic applies to return air grille placement. A high-level return grille on the long wall opposite the supply preserves flexibility. A floor-level return grille forces the rug layout to leave that grille uncovered, which often conflicts with the educator's preferred programming geometry.

For SBKJ duct line implications, the EYLF-flexible diffuser layout favours linear slot diffusers and rectangular trunk ductwork — the standard product of the SBAL-V auto duct line in galvanised configuration. The trunk is sized for the room ventilation rate at 15 L/s per person plus the additional supply from the vestibule preconditioning function.

Quality Area 2 — Children's health and safety

Quality Area 2 is the largest single driver of HVAC scope at accreditation depth. It contains:

• Standard 2.1 Health. Each child's health and physical activity is supported and promoted. This translates into AS 1668.2 outdoor air at 12 to 15 L/s per person, ASHRAE 62.1 CO2 monitoring at less than 1000 ppm in the classroom, MERV 13 minimum filtration with HEPA H13 in infant rooms (progressive operators), 22 to 24 Celsius temperature, 40 to 60 percent relative humidity, and the avoidance of cold-air drafts on floor-mat play areas.
• Standard 2.2 Safety. Each child is protected. This includes biological safety — the 25 L/s minimum nappy change room extract, the bottle preparation steriliser extract, the sick child isolation room separate handling, the allergen-free preparation zone separated from the general kitchen. It also includes chemical safety — the WES ceilings on chlorine 0.5 STEL (pool and nappy disinfection), peracetic acid 0.4 STEL (Sterrad/Steris sluice), ozone 0.1 TWA (UV sanitation and laser printer), formaldehyde 1 STEL (laminated MDF furniture off-gassing in newly fitted rooms), and respirable dust 10 mg/m³ (sandpit and craft materials transferred indoors).

Quality Area 2 is the source of the most common compliance breach at NQS rating — migration of odour and bioaerosol from the nappy change room into adjacent learning rooms, indicating undersized extract or poorly sited grille. SBKJ engineers consistently observe that the cure is mechanical: 25 L/s minimum extract (uplifted to 35 to 50 L/s for multi-station facilities), grille directly above the change table within 1.5 metre radius, dedicated fan running continuously, no recirculation, room held at minus 5 to minus 10 Pascals relative to corridors, and extract construction in 304 stainless on the SBAL-V to resist disinfection washdown.

The accreditation depth of Quality Area 2 also drives the sick child isolation room. NQS Quality Area 2 recommends a separate room for children who become unwell during a session, where they wait with a staff member for parent collection. SBKJ engineers a light-duty ASHRAE 170 pattern for this room — 6 ACH, MERV 13 minimum with HEPA H13 single-pass extract option, minus 5 Pa relative to corridor, no recirculation, 304 stainless extract duct on the SBAL-V with the SB-ZF1500 stitchwelder finishing the HEPA H13 housing transitions. The room finishes are wipeable to allow chloride disinfection between users.

Quality Area 3 — Physical environment

Quality Area 3 covers the design and arrangement of the indoor and outdoor space and the materials used. The two standards are:

• Standard 3.1. The design of the facility is appropriate for the operation of a service. Authorised officers compare the as-built facility against the intended operating model and assess fit. HVAC consequences include the ability of the room to hold its temperature setpoint during a rating visit (auditors often touch the wall, observe diffuser airflow patterns and notice draft on floor-mat areas), the audible noise level (subjective NC assessment), the acoustic comfort between rooms and from outdoor play (return air grille placement matters), and the cleanliness of supply and return grilles (a dust-loaded grille indicates poor maintenance regime).
• Standard 3.2. The service environment is inclusive, promotes competence and supports exploration and play-based learning. The HVAC effect here is the absence of features that constrain inclusive use — controls accessible to educators with disabilities, AHU noise not interfering with hearing-loop systems for hearing-impaired children, grille height accessible from a wheelchair, no hot supply diffuser face within reach of a child standing on furniture.

Quality Area 3 is the largest single area assessed under HVAC criteria. Authorised officers may request mechanical drawings, commissioning reports, balance reports and operational records. The accreditation depth here is that operators with poor NQS Quality Area 3 ratings face parent enrolment drop-off, advertising pressure on the service web profile, and remediation requirements that disrupt operations.

Quality Area 4 — Staffing arrangements

Quality Area 4 covers educator-to-child ratios, qualifications and continuity. The HVAC engineering effect is in the working spaces educators occupy — the staff room comfort, the lactation room (where the educator may be a feeding parent), the sluice room ergonomics during nappy disposal, the kitchen staff working conditions, and the office and admin space comfort for non-educator staff.

Standard 4.1 organisation of educators emphasises continuity and qualifications. Standard 4.2 professionalism of educators emphasises ethical practice and ongoing professional development. Neither standard writes HVAC specifications directly, but a centre where the staff room is uncomfortable, the sluice room is malodorous and the kitchen is too hot or too cold reports lower educator retention — and educator retention itself is what Quality Area 4 measures.

Quality Area 5 — Relationships with children

Quality Area 5 covers the quality of educator-child interaction — how educators engage with children, how children's wellbeing is supported, how relationships are characterised. The HVAC engineering effect is again subtle but real. Acoustic comfort at NC 35 in active rooms and NC 25 in sleep rooms allows educators to speak at a normal level rather than projecting over AHU noise. Noisy AHU plant shifts educator voice to a higher register that children read as authority and stress rather than warmth. Visible diffuser airflow that disturbs play (paper blowing, hair waving) creates micro-stress in the room.

The accreditation depth of Quality Area 5 is that the engineering choice between a 4-way ceiling diffuser at 5 m/s face velocity (creating perceptible airflow on a floor-mat) and a linear slot diffuser at 2.5 m/s face velocity (diffusing across the room with no perceptible movement on the mat) directly affects the educator-child interaction quality.

Quality Area 6 — Collaborative partnerships with families and communities

Quality Area 6 covers the relationship between the service and the families it serves. The HVAC engineering effect is in the welcoming reception lobby comfort — a parent arriving at 7 am in a Melbourne winter walking into a poorly conditioned reception lobby forms a negative first impression that the centre director cannot recover. Vestibule pre-conditioning between outdoor and indoor setpoints is engineered for this transition.

Quality Area 6 also covers the parent feedback channel, including ventilation complaints. Operators that maintain an open parent feedback channel surface ventilation issues early — the parent who notices their child comes home with chilled hands every Wednesday afternoon is reporting a draft on the floor mat in the kinder room. The mechanical solution is straightforward (re-aim or replace the diffuser, increase the diffuser size to reduce face velocity, add throw deflectors), but it requires the feedback channel to surface the issue.

Quality Area 7 — Governance and leadership

Quality Area 7 covers the systems that support quality operation — risk management, complaints handling, record-keeping, leadership culture. The HVAC engineering effect is in the commissioning evidence pack the approved provider holds and produces for authorised officers at rating. The evidence pack must include design intent statements, calculated airflows, measured airflows, AHU performance verification, acoustic measurements against NC 35 active and NC 25 sleep, AS 4072 fire damper drop-test certificates, AS 1670 detection coordination records, AS 1428.1 DDA access records, and ongoing operational logs including continuous CO2 trend records.

The accreditation depth of Quality Area 7 is that the evidence pack itself is the artefact authorised officers audit. A perfectly built mechanical system without a paper trail rates lower than a marginally compliant system with full evidence of how it was designed, commissioned and is being maintained.

3. The facility taxonomy — eight distinct early childhood typologies

Early childhood education and care in Australia has more distinct facility typologies than is commonly understood, and each has its own ventilation engineering character. The taxonomy below frames the rest of this guide.

Typology 1 — Standalone childcare centre (long day care)

The most common typology. A purpose-built or fitted-out centre operating 7 am to 6 pm Monday to Friday with a licensed capacity of 30 to 150 children across age cohorts 6 weeks to 5 years. Includes infant rooms (0 to 2), toddler rooms (2 to 3), kinder rooms (3 to 4), preschool rooms (4 to 5), sleep rooms, nappy change facilities, bottle preparation room, kitchen, sluice room, allergen-free preparation zone, sick child isolation, lactation room, indoor-outdoor vestibule, outdoor play area, office, admin and staff room. Operators include G8 Education, Goodstart Early Learning, Bright Horizons Australia, Only About Children, Petit Early Learning Journey, the legacy Affinity Education portfolio, KU Children's Services, Gowrie, Big Fat Smile, C&K Catholic, the Catholic Mission of Australia diocesan operators, Uniting Care Childcare, Anglicare Sydney VIC QLD, Bumble Bee Early Learning, Story House Early Learning, Edmen Group and hundreds of independent community and family-owned centres. The engineering scope is the full SBKJ machine package covered in Section 18.

Typology 2 — Sessional kindergarten and preschool

A sessional service operating typically 9 am to 3 pm Monday to Friday or three to five days per week for children aged 3 to 5 years, often funded through state programmes (Victorian Free Kinder, NSW preschool funding, Queensland kindergarten). Smaller scale than long day care, often co-located with a school or community centre. Operators include the state-funded kindergarten networks, KU Children's Services, Gowrie network, community-managed kindergartens, Catholic kindergartens through C&K Catholic and various diocesan operators. The engineering scope is similar to long day care but typically without infant rooms or extensive nappy change facilities — the kinder and preschool rooms dominate.

Typology 3 — OSHC (Outside School Hours Care)

Before-school care (typically 6:30 am to 8:30 am), after-school care (3 pm to 6:30 pm) and vacation care operating inside primary school facilities — the school hall, multipurpose room or dedicated OSHC room. Operators dominated by Camp Australia (market leader), Junior Adventures Group, and a long tail of single-school OSHC programs run by parent committees or the school itself, coordinated through the Outside School Hours Council Australia (OSHCA). The engineering scope inherits the school's existing AHU plant rather than a dedicated greenfield mechanical package. Typical work is AHU upgrades, ductwork extensions for new room configurations, acoustic improvements and schedule extension to cover the 6:30 am start.

Typology 4 — Family day care residence

A private home approved under the National Regulations to operate as a regulated childcare service for up to four children plus the educator's own children. Coordinated through an approved family day care coordinator and Family Day Care Australia (FDC peak body) supports the educator network. Because the dwelling is residential (NCC Class 1a) the HVAC obligation is fundamentally different from a Class 9b centre. AS 1668.2 outdoor air rates not directly applied; the residence relies on operable windows, residential split systems and household exhaust. Accreditation under NQS Quality Area 3 requires well-ventilated rooms, functioning bathroom and kitchen extract, acoustically reasonable sleep room. SBKJ engineers consult on FDC upgrades on request from approved coordinators, with typical interventions being an inline heat-recovery exhaust unit, a CO2 sensor with audible alarm at 1500 ppm and a window-opening reminder system.

Typology 5 — Child and maternal health centre

A clinic providing combined nurse-led child and maternal health services, child development assessments, breast-feeding support, immunisation and family education. Operators include NSW Health Child and Family Health Service (with the Karitane and Tresillian sleep and feeding networks), the Victorian Department of Health municipal child health network (administered by local councils), the Queensland Child Health network, and the equivalent state and territory services. Royal Children's Hospital Melbourne operates a parent-baby unit. The Royal Hospital for Women Sydney provides related services. Lullaby Trust, SIDS&Kids and SIDS Australia campaign on safe sleep practice but do not operate clinics. The clinic is classified NCC Class 9a healthcare and follows the SBKJ Hospital and Healthcare HVAC Ductwork Guide pattern, not the childcare pattern. Sometimes co-located with childcare in integrated family centres.

Typology 6 — Integrated family centre

A co-located facility combining childcare, sessional kindergarten, child and maternal health services, parenting support and sometimes allied health (speech pathology, occupational therapy, physiotherapy). Often operated under Lendlease PPP arrangements, John Holland Education delivery, or by Anglicare Sydney VIC QLD SA WA, Uniting Care, the various Catholic diocesan operators or Mission Australia. Engineering scope combines Class 9b assembly (childcare and kindergarten), Class 9a healthcare (child health clinic, allied health rooms) and Class 5 commercial (administration). Each zone on its own AHU with defined pressure relationships and dedicated extracts.

Typology 7 — Early intervention and allied health centre

Specialist services for children with developmental delay, sensory processing difficulties, autism spectrum needs or physical disability. Includes speech pathology, occupational therapy, physiotherapy and sensory/Snoezelen rooms. May operate independently or as a wing of an integrated family centre. Sensory and Snoezelen rooms have particular HVAC requirements — controlled lighting interlocked with HVAC, gentle airflow under 0.15 m/s at face level, controlled humidity 45 to 55 percent, NC 30 acoustic.

Typology 8 — Indigenous-owned and not-for-profit community service

Aboriginal Community Controlled childcare services operate under the same NQS framework but with additional Aboriginal cultural safety and Indigenous engagement standards. Funded through IBA Indigenous Business Australia equity, Future Super impact investment, federal Closing the Gap programmes and state Indigenous-specific programmes. Service typology overlaps with long day care (Typology 1) but often serves families in regional and remote locations where the building stock includes older premises with HVAC upgrade requirements. The engineering brief is the same but the practical delivery often emphasises retrofit of existing facilities rather than greenfield construction.

Many real-world facilities combine several of these typologies into a single site. The engineering job is to design each room to its own standard while integrating utilities, AHU plant and emissions paths into a coherent whole that respects the families and educators the facility serves.

4. Zoning the facility — the ventilation zone discipline

A standalone Australian childcare centre or integrated family centre typically divides into nine to twelve distinct ventilation zones, each on its own AHU branch, each with a defined pressure relationship to its neighbours. The discipline of the design is enforcing those relationships everywhere the air can move — through doors, through ductwork, through unsealed penetrations, through stack-effect at multi-storey transitions.

• Zone 1 — Infant rooms (0 to 2 years). Dedicated room AHU, tight setpoint deadband at plus or minus 0.5 Celsius, MERV 13 minimum filtration with HEPA H13 progressive option, return air path engineered to avoid drawing across the nappy change area. Independent VFD on the supply fan for night-mode during winter close-down.
• Zone 2 — Toddler rooms (2 to 3 years), kinder rooms (3 to 4) and preschool rooms (4 to 5). Multi-zone AHU acceptable. VAV with reheat in east-west buildings. Diffuser layout avoiding floor-mat areas.
• Zone 3 — Sleep rooms. Dedicated AHU branch, lower setpoint at 19 to 21 Celsius, NC 25 acoustic, dim lighting interlocked with HVAC night-mode. Separate from general activity rooms.
• Zone 4 — Nappy change facilities, sluice room and bottle preparation room. Dedicated extract systems, no recirculation, direct to outside. Held negative relative to adjacent learning rooms. 304 stainless construction.
• Zone 5 — Sick child isolation and lactation room. Dedicated extracts, no recirculation, negative pressure relative to corridors for isolation and neutral pressure for lactation. 304 stainless extract for isolation room.
• Zone 6 — OSHC activity space. Programmable schedule with rapid pull-down at 6:30 am. Higher V_p than school hall baseline.
• Zone 7 — Kitchen, refrigerated meal storage and allergen-free preparation zone. AS 1668.2 plus NFPA 96 reference. Stainless ductwork inside the kitchen envelope and the allergen-free zone; black-steel exhaust riser on the SBLR-600 welder.
• Zone 8 — Sensory and Snoezelen room. Controlled lighting, gentle airflow, controlled humidity, NC 30. Dedicated AHU branch with VAV.
• Zone 9 — Office, admin, staff room and director's office. Standard commercial AHU at 10 L/s per person, separate from learning room zones.
• Zone 10 — Indoor-outdoor vestibule. Pre-conditioning buffer between climate-controlled indoor space and outdoor play area. Sized at 50 percent of adjacent learning room rate.
• Zone 11 — Co-located child and maternal health clinic (where applicable). NCC Class 9a healthcare wing. ASHRAE 170 pattern. Separate from childcare AHU plant. SBAL-V on 304 stainless for clinical extract.
• Zone 12 — Plant room, lift shaft and back-of-house. Minor ventilation, AS 1668.1 stair pressurisation where applicable for multi-storey.

A persistent failure mode in older Australian childcare retrofits is the single shared rooftop package serving infant rooms, toddler rooms, kitchen and nappy change on a common duct network. Within three to five years the infant room smells faintly of disinfectant from the sluice cycle, the sleep room cannot hold NC 25 because of kitchen exhaust fan noise transmitted through return air paths, and the AHU coils are scaled with chloride residue carried on shared return. The fix is always the same and always retrospective: tear out the shared system, install separate AHUs for each zone, replace contaminant-side ductwork in 304 stainless. The discipline at design stage is to insist on independent zones from day one.

5. Material selection — galvanised general, 304 stainless wet and clinical, black-steel kitchen

The default sheet metal across Australian commercial HVAC is galvanised steel to AS 1397 Z275, formed on an SBAL-V auto duct line and snaplocked at the seams. For childcare specifically the material selection pattern is:

• AS 1397 Z275 galvanised steel on the SBKJ SBAL-V auto duct line for general classroom, kinder room, preschool room, OSHC activity room, sleep room (supply — not extract), sensory room, music and drama room, office, admin, staff room, vestibule, outdoor play covered yard makeup and corridor. Sheet thickness 0.6 mm to 1.0 mm. Z275 galvanizing minimum for coastal centres (Sydney, Brisbane, Perth, Adelaide) where chloride exposure shortens duct life.
• 304 austenitic stainless steel on the same SBAL-V line configured for stainless coil for the centre kitchen (where stainless is preferred for cleanability), the nappy change extract, the sluice room (handling nappy disposal with peracetic acid sanitation), the sick child isolation extract, the bottle preparation steriliser extract, the lactation room sink extract, the allergen-free preparation zone supply and extract, the body holding chiller in a co-located health clinic, the refrigerated meal storage internal ductwork, and any extract subject to chloride disinfection washdown. Sheet thickness 1.0 mm to 1.6 mm.
• 16-gauge welded black steel on the SBKJ SBLR-600 longitudinal welder for the NFPA 96 commercial kitchen exhaust riser carrying grease-laden vapour. Continuous liquid-tight welded seams, no mechanical joints, continuous fire-rated wrap, hinged upblast roof fan, UL-300 wet-chemical fire suppression interface.

For accreditation depth, the material specification rationale should be documented in the design intent and referenced in the commissioning evidence pack. Authorised officers at NQS rating do not typically inspect ductwork material grade, but they may ask — particularly in newer centres where the operator is positioning the facility as premium. Documented material rationale also supports operator-side procurement audit and ESG sustainability disclosure.

6. Acoustic engineering — NC 35 active and NC 25 sleep

AS 2107 and AS 1276 set the acoustic criterion at NC 35 for active learning rooms and NC 25 for sleep rooms. The accreditation depth of acoustic engineering is that authorised officers increasingly request acoustic measurement reports at NQS rating — partly because parents notice noisy HVAC at drop-off and pickup, partly because diffuser regenerated noise is a strong signal of undersized ductwork, and partly because acoustic comfort directly enables educator-child interaction quality under Quality Area 5.

NC 25 in the sleep room. Approximately 30 dBA in a typical sleep room. Quiet enough that 30 sleeping toddlers in cots and stretcher beds are not disturbed by AHU noise, diffuser regenerated noise from undersized branch ductwork, or duct-borne fan-noise transmission from adjacent OSHC or activity rooms. Hitting NC 25 reliably requires:

• Sized ductwork — supply face velocity under 4 m/s, return face velocity under 3 m/s. Branch sizing typically larger than the rule-of-thumb pressure-drop sizing in office HVAC.
• Dissipative splitter attenuator on the supply branch within 2 to 3 metres of the sleep room, sized for 20 to 30 dB insertion loss across mid-frequency bands.
• Acoustic duct lining on supply and return runs within 6 metres of the sleep room. Lining material selected to meet Green Star Indoor Environment low-emission criteria.
• Vibration isolation on the AHU servicing the sleep room — spring isolators on the AHU base, flexible canvas connectors at fan discharge and return.
• Avoidance of line-of-sight from AHU supply fan through ductwork to the sleep room diffuser. Ductwork bends and attenuators break that line of sight.
• SBKJ SB-ZF1500 stitchwelder fabricating the 304 stainless attenuator outer casing around mineral-fibre baffles. The welded stainless casing has higher acoustic-attenuation performance than mechanically seamed alternatives because the welded joint does not transmit fan-induced vibration through panel gaps.

NC 35 in active rooms. Approximately 40 dBA. Below conversation level, allowing educators to conduct group story time without competing with HVAC noise. Achieved through the same techniques at lower intensity — sized ductwork (supply under 4.5 m/s, return under 3.5 m/s), shorter attenuators, lining within 4 metres of the diffuser.

NC 30 in lactation, sensory and admin. Approximately 35 dBA. The intermediate target for spaces where comfort and privacy matter but the room is not used for sleep.

NC 40 in kitchen, plant room and back-of-house. Approximately 45 dBA. Higher acoustic level acceptable where children are not the primary occupants.

Acoustic measurement is taken at design fan speed (full design flow), at occupancy-equivalent diffuser face velocity, and at multiple points within each room — typically the educator workstation, the rug area centre, and the sleep position closest to the AHU plant. A single point measurement showing NC 25 at one location while the diffuser regenerated noise at another point shows NC 35 fails the rating.

7. The infant room (0 to 24 months) — the highest-precision room in the centre

Infant rooms hold children aged 0 to 24 months. Infants thermoregulate poorly, are cared for at floor level much of the day, sleep multiple times per shift, are fed via bottle or by visiting feeding parents, and have nappies changed every 2 to 3 hours. The HVAC system has to handle all of this without producing drafts on the floor, without producing noise that wakes sleeping infants, without recirculating odour from the nappy change facility, and without elevating humidity from the bottle steriliser.

Design conditions. 22 to 24 Celsius, 40 to 60 percent RH, plus or minus 0.5 Celsius deadband. The deadband matters — a 1.5 Celsius swing felt by an adult educator is barely perceptible, but for a six-month-old in a sleep bag it can mean waking from cold or sweating from heat. Tight deadband requires a competent VAV with reheat strategy, modulating control valves rather than two-position, and a high-resolution room sensor not located adjacent to a diffuser jet or solar window.

Filtration. MERV 13 minimum, HEPA H13 specified by progressive operators (Bright Horizons, Only About Children, Guardian Childcare and Education). The filtration class is driven by paediatric respiratory health rationale: children under five present to GPs with respiratory illness more than three times the population average, and reducing PM2.5 and bioaerosol loading in the air they breathe for 8 to 10 hours a day is one of the few interventions facility owners directly control. HEPA H13 raises fan static pressure by approximately 250 Pa over a MERV 13 baseline — the AHU and ductwork must accommodate.

Diffuser layout. Avoid direct overhead drops onto the cot floor area. Linear slot diffusers along the room perimeter throwing across the room prevent drafts on sleeping infants. Return grilles located near the room centre, not adjacent to the nappy change zone.

Return air path. The infant room return path must not draw across the nappy change room. The simplest engineering solution is a ducted return picking up at the opposite side of the room from the nappy change door, with the nappy change room held under negative pressure by its dedicated 25 L/s exhaust.

Acoustic target. NC 30 in the activity portion of the room, NC 25 in any cot/sleep zone within the same room (many infant rooms include a discrete sleep zone). Diffuser regenerated noise from undersized ductwork is the most common acoustic non-conformance.

HEPA H13 single-pass housing. SBKJ fabricates the housing in 304 stainless with bag-in bag-out provision on the SB-ZF1500 stitchwelder. Bag-in bag-out provision allows the centre director or maintenance contractor to change filters without exposing the educator team to the loaded filter surface.

8. Toddler, kinder and preschool rooms — the largest occupancy load

Toddler rooms (2 to 3 years), kinder rooms (3 to 4 years) and preschool rooms (4 to 5 years) carry the largest occupancy load in a typical centre — at NSW ratios a single preschool room holds 11 children with one educator. The HVAC system handles peak occupancy through morning arrival, mid-morning peak activity, post-lunch quiet time, afternoon activity, and end-of-day pickup with consistently good comfort.

Design conditions. Toddler 22 to 24 Celsius, kinder and preschool 21 to 23 Celsius. 40 to 60 percent RH. Slightly cooler than infant rooms because the children are larger, more active, and more able to regulate their own thermal experience by adding or removing layers.

AS 1668.2 outdoor air at 12 to 15 L/s per person. Progressive operators uplift to 15 L/s for post-COVID community expectation. Cross-check ASHRAE 62.1 — the higher rate governs.

Multi-zone VAV with reheat. Toddler and preschool rooms in east-west oriented buildings experience large solar gain differentials. Multi-zone VAV with reheat handles this differential without overcooling south rooms to satisfy north rooms.

CO2 monitoring at less than 1000 ppm. Continuous CO2 logging in each room as objective ventilation-effectiveness signal. CO2 above 1500 ppm impairs concentration and triggers audible alarm. The Safe Work Australia WES CO2 5000 ppm TWA is an order of magnitude above the classroom target — the classroom target reflects learning outcome optimisation, not health protection.

Acoustic target NC 35. Below conversation level. Sized ductwork (supply under 4.5 m/s, return under 3.5 m/s). Shorter attenuators than sleep room. Lining within 4 metres of diffuser.

9. Sleep rooms — NC 25 and the quiet envelope

Sleep rooms hold sleeping children — typically toddlers in cots and preschool children on stretcher beds for the post-lunch sleep period (typically 1 pm to 3 pm). Sleep room HVAC has three jobs: keep the room cooler than activity rooms (19 to 21 Celsius supporting safe sleep practice), keep the room quiet (NC 25), and keep the room dim (lighting interlocked with HVAC night-mode).

Design conditions. 19 to 21 Celsius. Cooler than activity rooms because cooler ambient supports deeper sleep and reduces heat-related sleep disruption. The setpoint can be programmed to drop by 1 to 2 Celsius during the active sleep period and recover to activity-room setpoint before the children wake.

AS 1668.2 outdoor air at 10 L/s per person quiet. Reduced from active-room 15 L/s reflecting lower metabolic rate during sleep and lower CO2 production. The total CFM is lower but the air change rate at the lower temperature is similar.

Gentle airflow. Face velocity at the diffuser well below 2 m/s. Throw deflectors aimed across the room rather than directly down. Linear slot diffusers along the wall behind the cots. No diffuser directly above any cot.

Acoustic target NC 25. The tightest acoustic envelope in the centre. Engineered as described in Section 6.

Lighting interlock. A dimmable lighting circuit interlocked with HVAC night-mode allows the sleep room to be darkened simultaneously with the temperature setpoint dropping and the fan speed reducing. The simplest implementation is a single time-clock signal driving the BMS night-mode strategy across both lighting and HVAC.

SBKJ fabrication. The supply and return duct from the AHU to the sleep room is constructed in galvanised on the SBAL-V (interior of duct does not contact contaminant) with acoustic lining in the last 6 metres. The sound attenuator outer casing is 304 stainless welded on the SB-ZF1500 stitchwelder around mineral-fibre baffles for the highest acoustic-attenuation envelope.

10. The nappy change room and sluice room — the most common failure mode

The nappy change facility is the single most common source of AS 1668.2 non-conformance in Australian childcare design and the most common source of parental complaints at NQS rating visits. The standard mandates a minimum 25 L/s mechanical exhaust direct to outside, with no recirculation, on a dedicated fan running continuously during operating hours.

SBKJ engineering response:

• 25 L/s minimum. Uplift to 35 to 50 L/s for multi-station nappy change facilities serving multiple infant or toddler rooms.
• Dedicated fan, direct to outside. No sharing with toilet exhaust unless interlocked, run continuously, and sized for combined load. No recirculation through the AHU.
• Exhaust grille directly above the change table. Within 1.5 metre radius. Capturing odour and bioaerosol at source before the plume migrates into adjacent learning rooms.
• Negative pressure. Minus 5 to minus 10 Pascals relative to adjacent learning rooms. Verified at commissioning and re-verified every six months under AS 1851 maintenance.
• 304 stainless extract. Resists chloride disinfection washdown (sodium hypochlorite 1000 to 5000 ppm available chlorine), quaternary ammonium chlorides (quats), and peracetic acid sanitation (WES 0.4 ppm STEL). Constructed on the SBAL-V configured for stainless coil with continuous TIG-welded seams from the SB-ZF1500 stitchwelder.
• Sluice room treatment. The room handling actual nappy disposal (often co-located with the nappy change room or as a separate annex) operates at higher peracetic acid concentration during Sterrad and Steris sanitation cycles. WES peracetic 0.4 STEL ceiling. Extract sized at 35 L/s minimum on dedicated fan, room held at minus 10 to minus 15 Pa.

The accreditation depth of nappy change engineering is that authorised officers at NQS rating visits sometimes ask to inspect the room during a sanitation cycle — the moment when contaminant concentration is highest. A correctly designed extract handles the cycle with no migration. An undersized extract loses containment within seconds, with peracetic acid odour reaching the adjacent infant room.

11. Bottle preparation and formula room for under-1 babies

Bottle preparation and steriliser areas generate humidity from steam steriliser cycles, hot water bottle warming, and dishwashing of bottle parts. The humidity migrates into adjacent infant rooms if not controlled, elevating room RH above the 60 percent upper bound and encouraging mould growth.

Engineering:

• ISO 8 equivalent clean ventilation. 4 to 6 air changes per hour, MERV 13 minimum filtration, gentle laminar supply.
• Dedicated extract at 15 to 25 L/s. Dedicated fan, direct to outside. Sized for steam steriliser load.
• Make-up air from adjacent infant room. Bottle prep negative relative to infant room. Air flows infant room into bottle prep into outside.
• 304 stainless extract. Constructed on SBAL-V configured for stainless. SB-ZF1500 stitchwelder finishes the steriliser hood transitions.

Where bottle prep is co-located with kitchen functions (some smaller centres combine the spaces), the kitchen extract specification governs and the bottle prep extract becomes a sub-set of the kitchen extract.

12. The centre kitchen, refrigerated meal storage and allergen-free preparation zone

Most Australian childcare centres prepare a cooked midday meal on site rather than receiving prepared meals from a central kitchen. The centre kitchen is subject to FSANZ 3.2.2 and 3.2.3 food safety standards, AS 4326 cold chain HACCP, AS 1668.2 mechanical ventilation, AS 5601 LPG installation, AS/NZS 60079 hazardous area Zone 2 around the LPG burner inlet, and the NFPA 96 commercial kitchen reference for exhaust hood and ductwork.

Exhaust hood and grease duct. Type I grease hood over every cooking surface generating grease-laden vapours. Hood construction in 16-gauge stainless steel with welded liquid-tight seams. Exhaust duct in 16-gauge welded black steel produced on the SBKJ SBLR-600 longitudinal welder with continuous TIG-welded seams, no mechanical joints, no penetrations, no transverse seams unless welded. Continuous fire-rated wrap. Hinged upblast roof fan. UL-300 wet-chemical fire suppression interface.

Make-up air. From SBAL-V galvanised trunk at 80 to 90 percent of exhaust rate. Kitchen held slightly negative relative to dining room and learning rooms.

AS/NZS 60079 Zone 2 around LPG burner. Spark-resistant fan and duct construction in that zone. Earthing and bonding to AS 1020 dissipating static charge. Gas detection (WES CH4 1.25 percent LEL ceiling) interlocked to fan run-on and shutdown.

Refrigerated meal storage and pre-prepared lunch chillers. Under AS 4326. Stainless ductwork inside, externally insulated to prevent condensation drip onto food surfaces, drainage to tundish with air break. SBAL-V on 304 stainless.

Allergen-free preparation zone. Most Australian centres now operate peanut-free, nut-free, egg-free, dairy-free policies. Separate preparation surface and storage from the general kitchen with a partition and dedicated extract over the allergen-free preparation bench. Allergen-free zone runs slightly positive relative to the main kitchen so general kitchen flour, egg and nut dust cannot drift across. Supply and extract in 304 stainless on the SBAL-V.

13. Outdoor play, covered yard and weather shelter

The Education and Care Services National Regulations mandate 7 m² of outdoor play space per child — more than double the indoor requirement. Children move between climate-controlled indoor space and outdoor play multiple times per session, and the curriculum (under the EYLF) is designed around outdoor-indoor transition.

Outdoor play areas themselves do not require mechanical ventilation — the open environment delivers more than adequate fresh air. However, the engineering work concentrates on:

• Indoor-outdoor vestibule. Pre-conditioning buffer between climate-controlled indoor space and outdoor play. Typically 4 to 6 m² floor area, sized at 50 percent of adjacent learning room outdoor air rate. Prevents short-cycle door losses on the room AHU during the 8 to 10 outdoor transitions per session.
• Covered yard and weather shelter ventilation. Where the covered yard is partially enclosed (typical Australian centres have a roofed but open-sided covered yard), no mechanical ventilation. Where the weather shelter is fully enclosed (less common), AS 1668.2 outdoor air rate applies as for an indoor room.
• Sandpit and playground equipment. No HVAC engagement.
• Gardens. No HVAC engagement.

The vestibule supply and return duct is constructed on the SBAL-V in galvanised. The vestibule is typically the lowest-occupancy room in the centre but the highest-frequency transit space.

14. The sick child isolation room recommended by NQS Quality Area 2

NQS Quality Area 2 (Children's health and safety) recommends a separate room for children who become unwell during a session, where they wait with a staff member for parent collection. This is not a strict regulatory requirement but is an operational expectation strongly preferred by ACECQA authorised officers and almost universally provided in new centres.

Engineering follows a light-duty ASHRAE 170 pattern:

• 6 air changes per hour. Higher than activity rooms because the room is intermittently used for an unwell child who may be coughing or vomiting.
• MERV 13 minimum filtration with HEPA H13 single-pass extract option. The supply side is MERV 13. The extract from the room can be HEPA H13 single-pass to atmosphere, reducing cross-contamination risk to the educator providing care.
• Minus 5 Pascals relative to corridor. The room held under slight negative pressure relative to the corridor, drawing air from corridor into room into HEPA extract into outside.
• No recirculation. All extract direct to outside, no return air pickup feeding back into the centre AHU.
• 304 stainless extract duct on the SBAL-V. Wipeable surfaces, chloride disinfection compatibility, SB-ZF1500 stitchwelder finishing the HEPA H13 housing transitions.
• Wipeable room finishes. Vinyl flooring with coved skirting, wipeable wall surfaces, sealed ceiling tiles. Allows chloride disinfection between users.

The accreditation depth of the sick child isolation room is that ACECQA authorised officers increasingly note its presence and engineering. A correctly engineered isolation room supports a "Meeting NQS" or "Exceeding NQS" rating under Quality Area 2. Absence of the room or absence of separate extract is increasingly noted as a deficiency.

15. The lactation and breast-feeding room

Lactation rooms support feeding parents in the centre — whether centre staff, visiting parents who continue breastfeeding through the workday, or family members participating in transition-to-care visits. The room is increasingly expected in new centres and is universal in premium operator briefs (Only About Children, Petit Early Learning Journey, Bright Horizons).

Engineering:

• NC 30 acoustic. Quiet, private, calm.
• 22 to 24 Celsius, 40 to 60 percent RH. Comfortable for the feeding parent.
• MERV 13 filtration. Standard filtration class.
• Dedicated supply. No return air pickup that contaminates adjacent rooms.
• Electrical outlet for breast pump. AS/NZS 3000 wiring compliance.
• Sink with wipeable surface. Extract over the sink, 304 stainless on the SBAL-V for the small sink area.
• Lockable door, do-not-disturb signage. Privacy.

16. The sensory and Snoezelen room

Sensory and Snoezelen rooms support children with sensory processing difficulties, autism spectrum needs, attention regulation needs and early intervention requirements. The room features controlled lighting (typically dimmable LED), tactile surfaces, soft furnishings, fibre-optic light displays and ambient sound. The HVAC has to support this environment without disrupting it.

Engineering:

• Controlled lighting interlocked with HVAC. Lighting circuit and HVAC setpoint synchronised through BMS night-mode signal.
• Gentle airflow under 0.15 m/s at face level. No perceptible draft on the child seated or lying on the floor.
• Controlled humidity 45 to 55 percent. Tighter than the general 40 to 60 percent band because some sensory-sensitive children react to dry mucous membranes.
• NC 30 acoustic. Quiet enough to hear the ambient sound design without HVAC interference.
• 22 to 24 Celsius. Comfortable for prolonged sensory work.
• SBKJ SBFB-1500 spiral tubeformer for the round riser. Tightly controlled face velocity through round duct.

17. OSHC, vacation care and the school-shared space

Outside School Hours Care (OSHC) is the regulated childcare segment serving primary school children before and after school, on pupil-free days, and during school holidays. The dominant operators are Camp Australia (market leader) and Junior Adventures Group, with the Outside School Hours Council Australia (OSHCA) coordinating the operational layer across smaller providers.

OSHC operates inside school facilities — typically the school hall, multipurpose room or a dedicated OSHC space within the school footprint. Because OSHC inherits the school's existing AHU plant, the HVAC specification work differs from greenfield childcare fit-outs.

Engineering questions to answer for OSHC HVAC accreditation:

• Is the existing AHU sized for the OSHC operating window? OSHC activates 0700 to 0900 and 1500 to 1830 — both periods outside the typical school AHU operating schedule. AHU may need programmable schedule extension and rapid pull-down at 0630.
• Does the existing ventilation rate meet 15 L/s per person at OSHC ratio? School halls typically designed for 10 L/s per person infrequent assembly. OSHC uses the same space at higher density, longer hours, with younger children. Outdoor air rate often needs upgrade.
• Are there nappy change facilities? Most OSHC programmes serve children aged 5+ and do not include nappy change. Where OSHC serves Kindy/Prep children with toileting still in transition, the 25 L/s exhaust requirement applies.
• Is the acoustic environment acceptable? School halls are acoustically lively spaces designed for performance, not after-school homework time. Acoustic improvements (lining, attenuators, rebalancing) often form part of OSHC fit-out.
• Is the OSHC space clearly demarcated for NQS rating purposes? Where OSHC shares space with curricular school activities, the NQS rating visit assesses the OSHC operating period and configuration specifically.

Vacation care and holiday programmes run the same room at full-day occupancy (typically 8 am to 6 pm during school holidays) — the operating profile shifts toward long day care for those weeks, which the existing OSHC HVAC plant may or may not be sized for. The engineering decision is whether to size for the worst-case vacation-care load (high CapEx) or accept reduced occupancy during vacation periods (low CapEx).

18. The family day care residence — the residential exception

Family day care (FDC) is a regulated childcare service operated in a private home by an approved educator, for up to four children plus the educator's own children. The educator is supervised by an approved family day care coordinator who is themselves regulated by the state regulator. Family Day Care Australia (FDC peak body) supports the educator network and advocates with state regulators on operational matters.

The fundamental engineering difference from a centre is that the FDC dwelling is residential — NCC Class 1a. AS 1668.2 outdoor air rates are not directly applied; the dwelling relies on operable windows, residential split systems, household exhaust fans for bathroom and kitchen, and household cooking and laundry arrangements.

Accreditation under NQS Quality Area 3 (Physical environment) for FDC requires the room used for care to be well-ventilated, the bathroom and kitchen extract to be functional, and any room used for sleep to be acoustically reasonable. Authorised officers assess these qualitatively at FDC residence visits.

SBKJ engineers consult on FDC upgrades on request from approved family day care coordinators. Typical interventions:

• Inline heat-recovery exhaust unit. A small wall-mounted heat-recovery ventilator providing 20 to 40 L/s of fresh air with 70 to 80 percent heat recovery. Installed in the room used for care. Reduces winter heating cost while providing measurable outdoor air.
• CO2 sensor with audible alarm at 1500 ppm. A simple battery or USB-powered CO2 monitor giving the educator an objective signal to open windows. Cost typically AUD 150 to 300.
• Window-opening reminder system. Scheduled prompt to the educator's phone to open windows for cross-ventilation at specified intervals.
• Bathroom and kitchen exhaust verification. Test of the household exhaust fans to confirm air movement and absence of backdraft.

Mechanical retrofit of an FDC residence is rarely cost-effective at the scale of a single educator. Where it makes sense is in dedicated FDC purpose-built residences (a growing pattern in some regional areas where FDC is the primary childcare model) and in shared FDC hub buildings (residential-style buildings purpose-built to house multiple FDC operations).

19. The co-located child and maternal health centre

Child and maternal health clinics provide nurse-led services to families with infants and young children — child development assessment, breast-feeding support, immunisation, family education and triage referral to specialist paediatric services. The operators:

• NSW Health Child and Family Health Service, with the Karitane and Tresillian sleep and feeding networks providing specialised parent-baby residential and day-stay support.
• Victorian Department of Health municipal child health network, administered by local councils with funding through the Victorian DH, providing universal first-year-of-life checks and family support.
• Queensland Child Health network, operated by the Queensland Department of Health.
• Royal Children's Hospital Melbourne parent-baby unit, providing specialist tertiary-level paediatric and parent-baby services.
• The Royal Hospital for Women Sydney, providing antenatal, postnatal and early parenting services.
• Lullaby Trust, SIDS&Kids and SIDS Australia, campaigning organisations rather than clinic operators.

Child and maternal health clinics are sometimes co-located with childcare centres in integrated family centres — an increasingly common pattern in new Lendlease, John Holland, Built, Multiplex, Hutchinson Builders, DOMA Group in Canberra and Hesperia in Western Australia integrated education infrastructure projects, and in Anglicare Sydney VIC QLD SA WA and Catholic Mission of Australia diocesan delivery.

The clinic is classified NCC Class 9a healthcare and follows the SBKJ Hospital and Healthcare HVAC Ductwork Guide pattern, not the childcare pattern. Key engineering:

• ASHRAE 170 ventilation grades for consult rooms (6 air changes per hour, MERV 13 minimum filtration).
• Separation of clinical extract from childcare extract. Each on its own AHU. Cross-flow blocked through pressure cascade.
• Dedicated stainless extract from any procedure room. Where the clinic performs immunisations, dressings or minor procedures.
• Slight negative pressure on the clinical wing relative to the family-facing childcare wing.
• SBAL-V on 304 stainless for clinical extract; on galvanised for the childcare side.
• Sensory consideration for the parent-baby unit. Where the clinic includes a sleep and feeding consultation room (the Karitane and Tresillian model), the acoustic and humidity envelope follows the sleep room pattern at NC 25 to NC 30 and 45 to 55 percent RH.

20. The speech, occupational and physiotherapy rooms

Some early intervention centres include speech pathology, occupational therapy and physiotherapy rooms. These are clinical rooms following an outpatient healthcare pattern:

• 6 air changes per hour minimum.
• MERV 13 filtration.
• NC 30 acoustic. Quiet enough for speech therapy assessment of speech sound discrimination.
• 22 to 24 Celsius, 40 to 60 percent RH.
• No recirculation between clinical and childcare zones.

SBAL-V on galvanised for general supply and return; SBAL-V on 304 stainless where the room includes a sink (cleaning between clients).

21. Plant room, lift shaft and multi-storey integrated family centre engineering

Multi-storey integrated family centres — an increasingly common typology delivered by Lendlease PPP and tier-one builders — introduce engineering complexity beyond single-storey childcare:

• Plant room. AS 1668.2 Section 4 minor ventilation. Plant room negative relative to occupied spaces. Vibration isolation on AHUs serving sleep rooms above.
• Lift shaft. AS 1735 lifts. AS 1668.1 lift shaft pressurisation where required for smoke control.
• Stair pressurisation. AS 1668.1 stair pressurisation for fire-isolated stairs in multi-storey buildings.
• Vertical riser ductwork. Rectangular trunk on SBAL-V galvanised; round riser on SBFB-1500 spiral tubeformer.
• Inter-floor pressure relationships. Multi-storey buildings naturally develop stack-effect pressure gradients that can drive cross-floor contamination. The pressure relationships established at design must be verified at commissioning at each floor level.

22. SBKJ machine package for childcare projects

For an Australian standalone childcare centre, the SBKJ engineering team recommends the following machine package — scaled to project size and centre typology:

SBAL-V auto duct production line — AS 1397 Z275 galvanised steel

The workhorse for childcare ductwork. The SBAL-V auto duct line runs 0.5 to 1.5 mm material and produces rectangular duct up to 1500 mm wide with integrated pittsburgh seaming, TDF flanging and plasma cutting in a single platform. For general classroom, OSHC, vestibule, office, staff room, corridor and lower-load extract on a 90 to 120 place centre, the SBAL-V configured for galvanised coil produces all the rectangular trunk and branch ductwork in batch sizes that match a 6 to 8 week fit-out programme.

SBAL-V auto duct production line — 304 stainless steel

The same SBAL-V machine configured for 304 stainless coil produces stainless rectangular duct for the centre kitchen (where stainless is preferred for cleanability), the nappy change extract, the sluice room (handling nappy disposal), the sick child isolation extract, the bottle preparation steriliser extract, the lactation room sink extract, the allergen-free preparation zone supply and extract, and any extract subject to chloride disinfection washdown. The stainless construction resists corrosion under condensing conditions, chloride exposure and peracetic acid sanitation.

SBSF-1525 longitudinal seamer

The SBSF-1525 longitudinal seamer rolls and welds heavier-gauge stainless plate for plenum and attenuator outer skins. In a childcare project the SBSF-1525 is used for the larger sound attenuator casings (for the NC 25 sleep room envelope), the larger HEPA H13 single-pass housings (for the infant room and the sick child isolation room), and any heavier-gauge plenum work where 1.6 mm to 3.0 mm plate is required.

SBFB-1500 spiral tubeformer

The SBFB-1500 spiral tubeformer produces round riser ductwork from 200 mm to 1500 mm diameter. In a childcare project the SBFB-1500 is used for return riser ductwork connecting the room-level branches to the AHU plant, for the economiser fresh-air pickup at the AHU intake, and for any spiral round branch where higher pressure performance than rectangular is required (HEPA H13 infant room branches in particular). Spiral round duct provides better pressure performance than equivalent rectangular at equivalent face velocity.

SB-ZF1500 stitchwelder

The SB-ZF1500 stitchwelder produces 304 stainless plenum and sound attenuator casings with continuous full-penetration welded seams. In a childcare project the SB-ZF1500 is the critical machine for the NC 25 sleep room sound attenuator envelope (welded stainless casing has higher acoustic attenuation than mechanically seamed alternatives because the welded joint does not transmit fan vibration through panel gaps), the infant-room HEPA H13 single-pass housing (welded stainless throughout with bag-in bag-out provision for safe filter change), the sick child isolation HEPA H13 single-pass housing, and the larger stainless plenum and silencer casings for the centre kitchen exhaust transition pieces.

SBPC1500 plasma profiler

The SBPC1500 plasma profiler cuts heavy plate for transition plate work, damper sleeves and reinforced penetration frames. In a childcare project the SBPC1500 is used for cutting AS 4072 fire damper sleeves to integrate into the duct on the SB-ZF1500 stitchwelder during fabrication, for cutting transition plates between rectangular trunk and round riser, and for cutting access door frames and inspection hatches.

SBLR-600 welder

The SBLR-600 longitudinal welder runs continuous welds on 16-gauge black-steel duct for the NFPA 96 commercial kitchen exhaust riser. Continuous TIG-welded seams, no mechanical joints, no penetrations, no transverse seams unless welded. This is the only place in a typical childcare project where black-steel duct is required — the rest of the centre is galvanised or stainless on the SBAL-V.

Spark-resistant configuration

SBKJ supplies a spark-resistant configuration for AS/NZS 60079 hazardous-area applications. In a typical childcare project the spark-resistant configuration is fitted only to the LPG kitchen burner enclosure — the LPG bullet area, gas train, regulators and burner inlet are AS/NZS 60079 Zone 2 hazardous area under normal operation. Spark-resistant fans, spark-resistant duct construction, earthing and bonding to AS 1020, gas detection (WES CH4 1.25 percent LEL ceiling) interlocked to fan run-on and shutdown.

23. The largest Australian childcare operators and their HVAC specifications

The Australian regulated childcare sector is dominated by a small number of large operators alongside hundreds of single-site community centres and state-funded preschools. The largest operators publish detailed facility briefs that mechanical contractors typically work to:

• G8 Education (ASX:GEM). The largest ASX-listed operator with 480-plus centres across the World of Learning, Caring Hands, Sandcastles, Headstart, Bambinos, Penguin, Buggles, First Grammar and Pelican brands. Centralised facility specifications for new fit-outs, with regional engineering oversight. AS 1668.2, BCA Class 9b, MERV 13 minimum, NC 35 active and NC 25 sleep, 25 L/s nappy change exhaust.
• Goodstart Early Learning. Australia's largest not-for-profit operator with 700-plus centres. Established the Australian Future Children's Fund. Strong sustainability and energy benchmarking focus, NABERS for Schools alignment in the brief, Climate Active certification target on premium centres.
• Bright Horizons Australia. US private-equity-backed premium operator. References ASHRAE 62.1 alongside AS 1668.2. HEPA H13 in infant rooms as standard. NC 25 sleep room and CO2 monitoring at less than 1000 ppm in classroom as standard.
• Affinity Education (formerly ASX:AFI). Delisted from ASX after sale to KKR and Quadrant in 2024 — was 240-plus centres. Specifications continue under new private equity ownership.
• Only About Children. Private premium operator across major metro markets. HEPA H13 infant rooms standard, NC 25 sleep rooms standard, dedicated infant room AHU standard, references both AS 1668.2 and ASHRAE 62.1.
• Petit Early Learning Journey (Petit ELJ). Premium private operator. Similar engineering profile to Only About Children.
• Camp Australia. The OSHC market leader. Operates several hundred OSHC sites across Australia. HVAC specifications inherit school plant; engineering work focuses on AHU upgrades, ductwork extensions, acoustic improvements and schedule extension.
• Junior Adventures Group. Major OSHC operator alongside Camp Australia.
• KU Children's Services. Long-established not-for-profit. Historic centres include some heritage premises. Strong sustainability focus and Indigenous engagement programmes.
• Gowrie network across NSW VIC SA WA TAS. Not-for-profit cooperative network with state-level autonomy. Standard AS 1668.2 specifications.
• Big Fat Smile. Not-for-profit operator concentrated in the Illawarra NSW region.
• C&K Catholic and the Catholic Education Centres. Catholic Education Centres operate centres across various dioceses. Standard AS 1668.2 specifications with diocesan oversight.
• The Mission Australia. Not-for-profit social services provider. Some childcare operations.
• Save the Children Australia. NGO-operated childcare in some locations.
• Uniting Care Childcare. Faith-based not-for-profit operator with national presence.
• Anglicare Sydney VIC QLD SA WA. Faith-based not-for-profit with regional autonomy across states.
• Bumble Bee Early Learning. Mid-size private operator.
• Story House Early Learning. Chain operator.
• Edmen Group. Smaller private operator.
• Indigenous Business Australia (IBA). Aboriginal Business Australia equity investor in some Indigenous-owned childcare services.
• Future Super. Impact investment fund with childcare investment exposure.

Across these operators the common technical positions are: AS 1668.2 outdoor air at 12 to 15 L/s per person, BCA Class 9b for the building, MERV 13 minimum filtration with progressive HEPA H13 in infant rooms, NC 25 sleep room and NC 35 active acoustic, 25 L/s nappy change exhaust minimum (uplifted to 35 to 50 L/s for multi-station), CO2 monitoring at less than 1000 ppm in the classroom, NABERS for Schools energy benchmarking, and Green Star low-emitting materials. Premium operators add HEPA H13 in infant rooms, dedicated infant room AHUs, Climate Active certification, tighter acoustic targets and continuous BMS monitoring with cloud access for regional facility managers.

24. The construction and EPC layer — Lendlease, John Holland, Built and the others

The construction layer delivering new Australian childcare facilities under PPP, design-and-construct and traditional procurement includes:

• Lendlease. Major PPP delivery of integrated family centres across NSW, Victoria and Queensland under state government early learning expansion programmes.
• John Holland Education. Childcare and integrated family centre construction.
• Built. Childcare construction across multiple states.
• Multiplex. Childcare construction.
• Hutchinson Builders. Childcare construction, particularly in Queensland.
• DOMA Group. Canberra-focused childcare construction.
• Hesperia. Western Australia childcare and integrated facility construction.
• Anglicare Sydney VIC QLD SA WA. Some self-delivered childcare construction alongside operational delivery.
• Catholic diocesan delivery. Various dioceses deliver childcare construction within their education networks.

For SBKJ, the construction layer represents the primary procurement channel for new-build childcare HVAC ductwork. Mechanical contractors working under these tier-one builders typically reference SBKJ machine specifications in their fabrication quote and bring SBKJ ductwork to the build through the tier-one quality assurance system. The accreditation depth of working with tier-one EPCs is that the documentation discipline they require — design intent statements, fabrication QA records, commissioning evidence packs — aligns closely with the NQS evidence pack required at first NQS rating after handover.

25. Commissioning and the NQS evidence pack

Commissioning a childcare HVAC system is not complete when the AHU runs and the rooms are at temperature. The handover deliverable is an evidence pack that survives both an Education and Care Services regulator inspection and an NQS rating visit. The pack should include:

1. Design intent statement. What the system was designed to deliver — outdoor air rates at 12 to 15 L/s per person, temperature setpoints by room type, humidity bands, acoustic targets (NC 35 active, NC 25 sleep), filtration class (MERV 13 minimum with HEPA H13 in infant and isolation rooms), fire-rated separations, CO2 monitoring strategy at less than 1000 ppm classroom.
2. Calculated airflow schedule. Room-by-room calculated supply, return and exhaust airflows with the AS 1668.2 reference for each calculation.
3. Measured airflow report. Room-by-room measured airflows at every grille, by an independent commissioning agent, against the calculated values.
4. AHU performance test record. Coil performance, fan curves, motor draw, filter pressure drop at clean and dirty conditions, control valve stroke tests.
5. Pressure relationship record. Verified negative pressure in nappy change rooms (minus 5 to minus 10 Pa), neutral pressure in infant rooms, neutral or slightly positive pressure in learning rooms, negative pressure in sick child isolation (minus 5 Pa), negative pressure in kitchen back-of-house, positive pressure on allergen-free zone relative to general kitchen.
6. Acoustic measurement report. NC ratings measured at each room type at design fan speed, witnessed against the design targets, including NC 25 in sleep rooms and NC 35 in active rooms. AS 2107 and AS 1276 verification.
7. AS 4072 fire damper installation and drop-test certificates. Witnessed installation of every fire damper, with a drop-test certificate for each. AS 4072.3 ventilation duct system fire damper certification.
8. AS 1670 fire detection coordination record. Smoke detection coordinated with HVAC fire and smoke damper strategy. Wired-back to fire alarm panel.
9. AS 1428.1 DDA access record. Grille height, control accessibility, audible signalling not interfered with by AHU noise.
10. AS 1735 lift coordination. Where multi-storey integrated family centre includes lift, AS 1735 compliance certificate.
11. Filter change-out schedule. Documented schedule for MERV 13 (annual) and HEPA H13 (twice yearly), with manufacturer guidance on pressure drop trigger points.
12. Maintenance manual for the centre director and nominated supervisor. Non-engineer-readable summary of what the system does, how to identify obvious faults, who to call.
13. BMS operator training certificate. Training delivered to the centre director and at least one senior educator on the operator interface.
14. Pre-occupation purge log. Documented 72-hour pre-occupation purge before children occupy the building, controlling TVOC from newly fitted materials below Safe Work Australia general VOC ceilings.
15. Continuous CO2 logging baseline. First two weeks of CO2 trend data after occupancy to establish operating baseline against the less than 1000 ppm target.

This pack is the foundation for both NQS rating and ongoing essential safety measures compliance. The marginal cost of preparing the pack at handover is small; the cost of trying to reconstruct it three years later when the authorised officer asks is large.

26. Ongoing operational verification

Childcare HVAC systems run 50 weeks a year, 11 hours a day, with a vulnerable user population. Ongoing verification is part of the service model:

• Quarterly AHU service. Coil clean, filter inspection, belt and coupling inspection, control valve stroke test, drain pan clean.
• Annual ductwork inspection. Visual inspection of internal duct condition, joint integrity, acoustic lining condition, damper position verification.
• Annual filter replacement. MERV 13 typically annual; HEPA H13 typically twice yearly. Pressure-drop logging gives an objective trigger.
• Annual AS 4072 fire damper drop test. Mandated by the building's essential safety measures schedule under AS 1851.
• Biennial duct cleaning. Internal duct cleaning with NADCA-style protocols, with before-and-after photographs.
• Continuous CO2 logging. CO2 in each learning room as objective ventilation-effectiveness indicator. Trend lines should not exceed 1000 ppm peak occupancy.
• Continuous temperature and humidity logging. Trend lines should sit within room-type design bands.
• Annual acoustic re-verification. Optional but increasingly common — an annual acoustic measurement against NC 35 active and NC 25 sleep targets to detect AHU plant drift or duct system degradation.
• Annual personal exposure monitoring for educators. WES sampling for any chemistry-relevant exposure — chlorine 0.5 STEL (nappy disinfection), peracetic 0.4 STEL (sluice sanitation), formaldehyde 1 STEL (new room off-gassing), ozone 0.1 TWA (UV sanitation if fitted).

Many operators now write continuous monitoring requirements into the consultant brief, with the data accessible to the regional facility manager via a cloud BMS. The cost of this monitoring layer is small relative to the operational risk it manages and the NQS rating support it provides.

27. The Child Safe Standards and physical environment implications

The Royal Commission into Institutional Responses to Child Sexual Abuse delivered its final report in 2017 and made specific recommendations on physical environment design in services for children. Each state has subsequently adopted Child Safe Standards:

• Victoria. Child Safe Standards from 2017 administered by the Commission for Children and Young People.
• NSW. Child Safe Standards from 2022 administered by the Office of the Children's Guardian.
• Queensland. Child Safe Standards administered by the Queensland Family and Child Commission.
• Other states. Equivalent standards across SA, WA, TAS, ACT and NT.

The HVAC engineering effect is in:

• Visibility and accessibility of plant rooms. Plant rooms locked, restricted access, not accessible to children. Lockable plant room doors. CCTV coverage on plant room access where the centre has CCTV.
• Locked-cupboard treatment of chemical storage spaces. Cleaning chemical store under AS 1940 also locked, restricted access, and isolated from child-occupied spaces by lockable solid-core door.
• Line-of-sight from corridors and educator workstations into all child-occupied spaces. The HVAC engineering effect is indirect — no plant or ductwork should obstruct line-of-sight through glazed observation windows from corridors into rooms or from educator workstations into play zones. Surface-mounted ductwork should run high-level along the wall opposite the observation window.

28. ESG, NABERS for Schools and Climate Active

The energy performance and broader ESG positioning of an Australian childcare centre is increasingly tracked via:

• NABERS for Schools. The National Australian Built Environment Rating System extension covering educational facilities including early learning and OSHC. Larger operators (G8 Education, Goodstart, Bright Horizons, Only About Children) are increasingly writing target NABERS ratings into the consultant brief.
• Climate Active certification. Carbon neutrality certification at the centre or operator level. A growing parental-marketing differentiator at the premium end of the market.
• Green Star Indoor Environment credit. Low-emitting materials, low-VOC sealants and gaskets, low-emission ductwork insulation. Increasingly written into the brief by both ESG-conscious operators and tier-one builders.

HVAC engineering responses:

• Heat recovery on outdoor air. Heat wheel or plate exchanger on the outdoor air feed recovers 60 to 80 percent of energy in the exhaust stream during winter heating. At 15 L/s per person and 100 occupants, the energy at stake is significant — heat recovery typically pays back within 3 to 5 years.
• VFD on supply and return fans. Variable speed drives allow the AHU to track real occupancy via CO2 trim, dropping fan energy by 40 to 60 percent during shoulder hours.
• Duct sizing for low pressure drop. Slightly larger duct sizes reduce fan energy across the 10 to 15 year asset life. SBKJ SBAL-V auto duct line accommodates the slightly oversized branches at marginal incremental cost.
• Insulation specification. External duct insulation prevents condensation in summer and reduces heat loss in winter.
• AHU efficiency. IE3 or IE4 motors, high-efficiency coils, low-pressure-drop filter banks.
• Low-emitting materials throughout. Green Star compliance from sealants, gaskets, lining materials. Documented in the design intent.

29. How SBKJ supports childcare projects

SBKJ Group's Australian operation is headquartered in Box Hill North, Victoria. Mechanical contractors fitting out childcare projects across Australia work with us on three workstreams:

• Duct line specification and supply. SBAL-V auto duct line in the standard configuration with options — Z275 galvanizing for coastal centres, 304 stainless coil for wet and clinical areas, TDF flanges for pressure-tested seams, acoustic lining capability, filter-class-appropriate face velocities. The full machine package described in Section 22.
• Engineering review. Review of the consultant's mechanical specification against AS 1668.2, BCA Class 9b, the operator brief, ACECQA NQS Quality Area 3 and the seven quality areas. Free for shortlisted projects.
• Commissioning support. Pre-handover review of the commissioning evidence pack, with sample reports from comparable centres for comparison.

30. Where this fits in the broader SBKJ insights library

This guide is part of the SBKJ insights library covering Australian institutional HVAC sectors. Closely related guides:

• Childcare Centre, Kindergarten and OSHC HVAC Ductwork Guide — the core working-consultant guide that this accreditation-depth article complements.
• K12 Schools (Public, Catholic, Independent) and STEM Lab HVAC Duct Guide — covers the primary and secondary school sector where OSHC programmes operate inside school facilities and where preschools and kindergartens are sometimes attached.
• University, TAFE Workshop and Engineering Lab HVAC Duct Guide — the tertiary education end of the educational pipeline.
• Aged Care, Retirement and Disability HVAC Duct Guide — the other end of the lifecycle, with parallel considerations around vulnerable user populations and accreditation rating regimes.
• Hospital, Operating Theatre, ICU, Cath Lab, MRI, Radiology and Surgery HVAC Duct Guide — the engineering precision applied in paediatric wards and neonatal units informs the design of co-located child and maternal health clinics.
• Dental Clinic and Surgery HVAC Duct Guide — relevant where the integrated family centre includes a paediatric dental component.

31. Speaking to an SBKJ engineer

For mechanical contractors fitting out childcare centres, kindergartens, preschools, integrated family centres, OSHC rooms or family day care residences across Australia, SBKJ engineers in Box Hill North respond to specification queries within 12 hours. The SBKJ technical library at /machines.html includes detailed product specifications for the SBAL-V auto duct line, SBSF-1525, SBFB-1500, SB-ZF1500, SBPC1500 and SBLR-600. The SBKJ insights library contains over 100 sector-specific engineering guides covering institutional, healthcare, education and industrial HVAC ductwork.

Talk to an SBKJ engineer about your childcare accreditation project →

FAQ

How do the seven ACECQA NQS quality areas affect HVAC design?

All seven quality areas touch HVAC. Quality Area 1 (educational program) constrains diffuser layout to preserve EYLF-flexible room geometry. Quality Area 2 (children's health and safety) drives outdoor air at 12 to 15 L/s per person, CO2 monitoring at less than 1000 ppm, nappy change extract, sick child isolation, allergen-free zone. Quality Area 3 (physical environment) is the largest single area assessed under HVAC criteria. Quality Areas 4 to 6 cover educator and family experience including acoustic comfort. Quality Area 7 (governance) requires the commissioning evidence pack.

Why CO2 less than 1000 ppm not the WES 5000 ppm?

Safe Work Australia WES CO2 5000 ppm TWA is the health-protection ceiling. The classroom target at less than 1000 ppm reflects learning outcome optimisation — concentration and learning impair above 1500 ppm. Post-COVID guidance from ACECQA and the NHMRC has converged on continuous CO2 monitoring as the most accessible objective indicator of ventilation effectiveness.

What is the AS 1668.2 outdoor air rate for childcare?

12 L/s per person minimum with progressive operator uplift to 15 L/s per person for toddler, kinder, preschool and OSHC rooms. Substantially higher than the 10 L/s per person ASHRAE 62.1 minimum for general occupancy because of higher metabolic activity, peak ratio occupancy density, infectious-illness load and post-COVID community expectation.

What duct material for nappy change, sluice and sick child isolation?

304 stainless on the SBKJ SBAL-V auto duct line configured for stainless coil, with continuous TIG-welded seams from the SB-ZF1500 stitchwelder. The 304 stainless tolerates chloride disinfection washdown, peracetic acid sanitation (WES 0.4 STEL) and the daily wet-wipe cycles that destroy galvanised duct.

Why NC 25 sleep room and not NC 30?

AS 2107 and AS 1276 set NC 25 for childcare sleep rooms. NC 25 (approximately 30 dBA) is quieter than typical adult bedrooms (NC 30 to 35) because young children move between light and deep sleep more frequently, and a single noise excursion typically wakes them.

What size is the nappy change extract?

25 L/s minimum direct exhaust to outside on dedicated fan per AS 1668.2. Uplifted to 35 to 50 L/s for multi-station facilities. Grille directly above change table, room held at minus 5 to minus 10 Pa, no recirculation.

NFPA 96 and AS/NZS 60079 for the centre kitchen?

Yes — where the centre kitchen prepares grease-laden cooked meals, NFPA 96 commercial kitchen exhaust principles apply alongside AS 1668.2 Section 4 and AS 5601 LPG installation. The exhaust duct is 16-gauge welded black-steel on the SBLR-600. AS/NZS 60079 Zone 2 hazardous area applies around the LPG burner inlet; spark-resistant configuration in that zone.

How does family day care differ from a centre?

FDC is NCC Class 1a domestic, not Class 9b. AS 1668.2 outdoor air rates are not directly applied. Accreditation under NQS Quality Area 3 requires well-ventilated rooms, functioning bathroom and kitchen extract, acoustically reasonable sleep room. SBKJ typical FDC intervention is an inline heat-recovery exhaust unit, a CO2 sensor alarming at 1500 ppm and a window-opening reminder system.

How does a co-located child health clinic differ?

The clinic is NCC Class 9a healthcare following the hospital HVAC pattern, not the childcare pattern. ASHRAE 170 ventilation, 6 ACH consult room, MERV 13 minimum, dedicated extract from procedure room, slight negative pressure on the clinical wing. SBAL-V on 304 stainless for clinical extract, galvanised on the childcare side.

Which SBKJ machines for a typical project?

SBAL-V on galvanised for general classroom and OSHC. SBAL-V on 304 stainless for kitchen, nappy change, sluice, sick child isolation, lactation, bottle prep, allergen-free zone. SBFB-1500 spiral for round risers. SBSF-1525 longitudinal seamer for heavier stainless plenum. SB-ZF1500 stitchwelder for NC 25 sleep room sound attenuator casing and HEPA H13 housing. SBPC1500 plasma for transition plate and damper sleeves. SBLR-600 welder for NFPA 96 black-steel kitchen exhaust. Spark-resistant configuration on the AS/NZS 60079 LPG kitchen burner only.