Pet Food Manufacturing HVAC Duct Guide — Canning, Dry Kibble, Wet, Treats, Bird Feed, Livestock Feed and Pet Pharmaceutical

Why pet food manufacturing HVAC is its own engineering category

Pet food manufacturing is one of the most under-appreciated multi-zone HVAC envelopes in the Australian food and feed sector. A modern integrated pet food plant — the Mars Petcare Wodonga site that produces Whiskas, Pedigree, Royal Canin, Iams, Eukanuba, Sheba, Cesar, Dreamies, Greenies, Optimum and Advance under the same roof; the Real Pet Food Co Ingleburn site producing Nature's Gift, VIP, Snappy Tom, ProDog and Black Hawk; the Nestlé Purina Petcare Australia Blayney site producing Pro Plan, Fancy Feast, Felix, Friskies, Pro Plan ONE, Pro Plan Veterinary Diet and Dentalife — runs perhaps eighteen to twenty-two distinct climatic and hazardous-area envelopes inside one building footprint. Grain reception silos at Zone 21 dust hazardous area, pneumatic conveyors and bucket elevators internal at Zone 21, hammermill and pellet mill external at Zone 22, mixer and ribbon-blender batching at Zone 22 with respirable feed dust at the operator interface, extrusion barrel at 80 to 150 degrees Celsius under steam injection, post-extrusion dryer at 60 to 90 degrees Celsius engineered to NFPA 86 industrial oven envelope, counterflow cooler at ambient temperature with extract dust at Zone 22, vacuum coater spraying tallow and palatability enhancer at 60 to 80 degrees, retort autoclave at 121 degrees Celsius under saturated steam for the wet line, can warmer pre-heat at 80 degrees, post-retort can cooler tunnel at 30 degrees with chloride-laden cooling water exposure, IQF blast freezer at minus 25 to minus 35 degrees with R-717 ammonia refrigeration, rendering cooker at 100 to 130 degrees discharging into a chemical scrubber and biofilter or RTO, pet pharmaceutical APVMA cleanroom at ISO 8 with HEPA-filtered supply, and back-of-house dispatch at ambient with grain dust residual.

Each envelope has its own duct material grade, sealing class, pressurisation differential, hazardous area zone rating and sanitation regime. Each is governed by a different combination of AS 5812 (Manufacturing and Marketing of Pet Food), AS/NZS 60079.10.2 (dust hazardous area), AS 3957 (dust hazard), NFPA 660 (the 2025 consolidated combustible particulate solids standard that supersedes NFPA 654, NFPA 61, NFPA 484 and NFPA 664), NFPA 86 (industrial oven), NFPA 68 (deflagration venting), NFPA 69 (explosion protection), AS/NZS 1677 (ammonia refrigeration), the PFIAA Pet Food Code of Practice CoP, the ISO 22000 HACCP framework, the APVMA Veterinary Medicines registration framework for medicated and pharmaceutical product, and the ARA Australian Renderers Association industry guidance for the rendering plant odour control train. The combustible dust deflagration risk is the single highest acute hazard in the dry kibble plant; the ammonia leak risk dominates in the wet pet food plant; the rendering plant H2S and NH3 odour emission dominates the EPA Air Quality compliance pathway; and the pet pharmaceutical APVMA cleanroom is engineered to TGA GMP principles equivalent to a human pharmaceutical facility.

SBKJ Group has supplied auto duct production lines, spiral tubeformers, stitchwelders, plasma cutters and longitudinal seam welders into the Australian pet food, animal feed, rendering and pet pharmaceutical sectors over the last decade. Our engineers from the Box Hill North VIC office have walked the Mars Petcare Wodonga extruder hall, the Real Pet Food Co Ingleburn dryer deck, the Nestlé Purina Blayney coater line, the Hill's Pet Nutrition Sydney scientific diet line, the Vetafarm Wagga Wagga bird feed pellet press, the Coprice Riverina ruminant pellet mill, the Ridley Corporation aquaculture feed extruder, the Snappy Tom retort hall, the Schmackos and Greenies baked treats oven, and the Australian Renderers Association member rendering plant scrubber-RTO-biofilter train. We have seen what fails on a fifteen-year duct lifecycle, what the PFIAA member audit flags first, what the APVMA inspector checks on a pet pharmaceutical site visit, and what the state EPA Air Quality officer asks about on a rendering plant inspection. This guide is written against that field experience. Pricing is held back here because pricing is meaningful only in the context of a specific plant brief; talk to an SBKJ engineer for an itemised landed-cost worksheet that ties scope to scope.

The Australian pet food and animal feed sector — operators, plants and product portfolios

Before specifying HVAC ductwork for any pet food or feed plant the engineering team has to know the operator, the plant location, the product portfolio, the throughput target and the regulatory envelope. The Australian pet food sector is dominated by four major integrated multinational operators, an Australian-owned challenger tier and a specialist artisan tier. The animal feed sector is dominated by one ASX-listed major and a regional cluster of stockfeed mills. The pet pharmaceutical sector is dominated by Virbac and Vetafarm with a long tail of specialist supplement producers.

Pet food — Mars Petcare Australia, Real Pet Food Co, Nestlé Purina and Hill's

Mars Petcare Australia is the largest pet food manufacturer in Australia and the largest pet food site in the Mars global portfolio. The Wodonga VIC headquarters site produces Whiskas wet and dry, Pedigree wet and dry, Royal Canin wet and dry (the prescription and veterinary diet variants are produced under tighter APVMA registration controls), Iams, Eukanuba, Sheba premium wet, Cesar dog wet pouches, Dreamies cat treats, Greenies dental chews, Optimum (Mars Australia premium domestic brand), Advance (Mars Australia veterinary-channel brand) and Dine wet pet food. The Asquith NSW site produces a complementary product portfolio and the Bathurst NSW site supports treats and supplemental product lines. Mars Petcare Wodonga is the single largest integrated pet food site in the southern hemisphere and runs every envelope in this guide — dry kibble extrusion line, wet pet food retort canning, treats and chews baked oven, IQF freezer for raw meat ingredient and an internal rendering capability for byproduct utilisation. The site holds PFIAA member status, APVMA registration for the veterinary-channel product (Royal Canin Veterinary Diet, Advance veterinary product), and Halal, Kosher and Australian Made certification across the product range.

Real Pet Food Co (RPF) is the largest Australian-owned pet food manufacturer and operates from Ingleburn NSW as the primary headquarters. The product portfolio includes Nature's Gift dry and wet, VIP wet pouches, Snappy Tom (the premium cat wet pet food brand acquired from the original Adelaide-based family operator), ProDog premium dry, Black Hawk (the premium grain-free natural dry pet food brand, with manufacturing across Hyderabad and Bega and brand ownership under the Real Pet Food Co umbrella) and a long tail of private-label product for the Australian and export retail channels. Real Pet Food Co is the consolidator of the legacy V.I.P. Petfoods family business and brings together the Australian-owned competitive challenge to the Mars and Nestlé international scale. The Ingleburn site is one of the most modern pet food extrusion plants in Australia, with twin extrusion lines at 200 to 500 kilograms per hour throughput and integrated dryer-cooler-coater trains.

Nestlé Purina Petcare Australia operates from Blayney NSW (central west New South Wales) with a major integrated pet food manufacturing site producing Pro Plan dry and wet, Fancy Feast wet pet food (the premium Nestlé cat wet pet food brand), Felix wet and dry, Friskies dry and wet, Pro Plan ONE (the supermarket-channel sub-brand), Pro Plan Veterinary Diet (the prescription-channel veterinary brand requiring APVMA registration) and Dentalife dental chews. The Blayney site runs dry kibble extrusion, wet pet food retort canning and treats and chews under one roof. Nestlé Purina operates to PFIAA, APVMA, ISO 22000 HACCP and Nestlé global manufacturing standards which exceed the Australian minimum on every dimension.

Hill's Pet Nutrition Australia manufactures the Hill's Science Diet and Hill's Prescription Diet lines for the Australian and Asia-Pacific veterinary channel. The product is engineered as veterinary-grade therapeutic and maintenance nutrition with tight specification on amino acid balance, mineral content, vitamin premix and palatability. Hill's manufacturing operates as an APVMA-registered veterinary-channel facility with controls equivalent to a pet pharmaceutical site. Sydney and Melbourne distribution and limited local processing complement the parent Colgate-Palmolive (NYSE:CL) global manufacturing network.

Australian-owned challenger tier — Stay Loyal, ZIWI, Black Hawk and Coprice Pet

Stay Loyal is the Australian-owned premium dry pet food brand produced for the Australian domestic market with grain-free and limited-ingredient formulation positioning. ZIWI Australia is the New Zealand-owned air-dried pet food brand with distribution across the Australian premium retail channel. Black Hawk Pet Food is now part of Real Pet Food Co as noted above. Lucky Dog Pet Foods and Doggone Pet Foods service the value and mid-market segment with private label and own-brand product. Trophy Pet Foods, TOTO Pet Foods and Australian Premium Bird Food (APBF) service specialist niches.

Treats and dental chews — Schmackos, Greenies, Dentastix, Whimzees

Schmackos (Mars Petcare Australia, manufactured at Wodonga VIC) is the dominant Australian dog treat brand. Greenies (Mars Petcare, with Australian product manufactured at Wodonga) is the leading dental chew brand. Dentastix (Mars Petcare under the Pedigree umbrella) is the supermarket-channel dental chew. Whimzees (Wellness Pet, with Australian distribution) is a premium dental chew alternative. Bonacibo services the export-influenced premium product segment. Australian Premium Pet Foods (APPF) services a specialist artisan treats segment with regional Australian ingredient positioning. The treats and dental chew envelope combines the baked oven engineering of NFPA 86 with the extrusion engineering of the dry kibble plant and adds thermoforming and vacuum forming on the moulded dental chew product.

Wet pet food retort and pouch — Mars, Real Pet Food Co, Nestlé Purina

Wet pet food in Australia is dominated by Mars Petcare Wodonga (Whiskas wet, Pedigree wet, Royal Canin wet, Sheba premium, Cesar, Optimum, Advance, Dine), Real Pet Food Co (Nature's Gift wet pouches, VIP wet pouches, Snappy Tom premium cat wet) and Nestlé Purina Blayney (Fancy Feast premium wet, Felix wet, Friskies wet, Pro Plan wet). The retort autoclave envelope, the can warmer pre-heat, the post-retort cooler tunnel and the seam-checker extract are the four critical HVAC duct branches in the wet pet food hall. Container formats span 3-piece tin can (legacy Whiskas and Pedigree wet), 2-piece aluminium can (premium Sheba, Fancy Feast, Royal Canin wet), aluminium pouch (Cesar dog pouches, Sheba cat pouches, Nature's Gift pouches) and aseptic stand-up pouch (premium specialist product). Snappy Tom under Real Pet Food Co specifically runs the aseptic pouch envelope and the seam integrity is the critical quality gate.

Bird feed and aviculture — Vetafarm Wagga Wagga, Trill, Avi-Plus

Vetafarm at Wagga Wagga NSW is the leading Australian specialist bird feed and aviculture nutrition manufacturer, producing parrot pellet, finch and canary seed mix, hand-rearing formula for breeders, probiotic and vitamin-mineral premix and avian-specific veterinary product including BeneFlex joint health and Vetfood supplement. The Vetafarm Wagga Wagga site is APVMA-registered for the veterinary product side. Trill (Mars Petcare under the Mars portfolio) is the supermarket-channel bird seed brand. Avi-Plus services the specialist parrot and aviary segment with imported and locally-blended product. The bird feed manufacturing envelope combines grain and seed dust hazardous area engineering (Zone 22) with AQIS biosecurity for Newcastle disease and HPAI bird flu prevention.

Aquarium and pond fish food — Aquasonic, Sera, Tetra, Hikari

The Australian aquarium and pond fish food segment is serviced by Aquasonic (Australian-owned aquarium nutrition specialist), Sera (German parent brand with Australian distribution), Tetra (Spectrum Brands global aquarium portfolio) and Hikari (Japanese parent brand with Australian distribution). Product formats include flake, pellet, stick, wafer, tablet and live food (brine shrimp, moina, daphnia). The aquarium food manufacturing envelope adds AQIS biosecurity controls and the live-food production hall operates as a separate clean envelope.

Livestock feed — Ridley Corporation, Coprice, Riverina Stockfeeds, Lienert

Ridley Corporation (ASX:RIC) is Australia's largest integrated livestock feed manufacturer, operating pellet mills servicing the dairy, poultry, pig, sheep, beef ruminant, horse and aquaculture sectors. Ridley operates manufacturing sites across multiple Australian states under the Cottesloe (poultry feed), Ridley AgriProducts (general livestock feed) and Ridley Aqua-Feed (aquaculture feed) brands. Coprice (Riverina rice-based ruminant feed) is a major specialist livestock feed manufacturer with a strong presence in the rice-growing regions and a complementary horse feed and farm livestock feed portfolio under the Dynavyte brand. Riverina Stockfeeds services the southern New South Wales mixed-farming and dairy sector. Wagga Stockfeeds services the Wagga Wagga region. Lienert Australia specialises in the medicated premix and ionophore-class additive segment with APVMA-registered product for ruminant, poultry and pig nutrition.

Rendering and animal byproduct — Australian Renderers Association members

Pet food rendering — the production of meat meal, blood meal, feather meal, fish meal, bone meal and tallow from slaughter byproduct — is the most aggressive odour-emission process in the entire pet food supply chain. The Australian Renderers Association ARA represents the rendering plant operators and publishes industry guidance on odour control. The Coprice Riverina, Hancock and various MIA Meat Industry Australia and AMIC Australian Meat Industry Council-affiliated abattoir-attached rendering plants supply the meat meal, blood meal and tallow used in the dry kibble extrusion line at Mars Petcare, Real Pet Food Co and Nestlé Purina. The vapour stream from rendering cookers at 100 to 130 degrees Celsius is rich in volatile fatty acids, amines (trimethylamine, putrescine, cadaverine), hydrogen sulfide, mercaptans and ammonia — the H2S exposure standard of 10 ppm 8-hour TWA and 15 ppm 15-minute STEL is the single critical worker exposure parameter in this envelope.

Pet pharmaceutical and supplement — Virbac, Vetafarm and the APVMA-registered tier

Virbac Australia at Milperra NSW is the leading pet pharmaceutical manufacturer in Australia, producing Drontal (worming), Bravecto (parasite control), Frontline (flea and tick), NexGard (parasite), Heartgard (heartworm), Advocate (flea and worm combination) and the broader veterinary pharmaceutical portfolio. Vetafarm at Wagga Wagga produces BeneFlex (joint health), Vetfood supplement and avian-specific veterinary product under APVMA registration. The pet pharmaceutical manufacturing envelope is engineered to TGA GMP principles equivalent to a human pharmaceutical facility — HEPA-filtered supply at H13 or H14 grade, terminal HEPA at the cleanroom envelope, positive pressurisation cascade from the ISO 5 aseptic core outward, 316L stainless ductwork with continuous welded seams throughout, smooth-bore interior with no dead spots, and dedicated extract at every operator interface station.

Insect protein pet food — Loop Farms, Aussie Crickets

The emerging insect-protein alternative pet food segment is serviced by Loop Farms and Aussie Crickets in Australia, with house cricket, black soldier fly larvae and mealworm farming as the upstream input to alternative-protein dry pet food product. The cricket farm envelope adds controlled humidity, controlled temperature, ammonia and frass droppings management to the standard pet food manufacturing envelope. This segment is small but growing and engineering is in the early-adopter phase.

What makes pet food manufacturing HVAC mechanically distinctive

Combustible dust deflagration risk — the single highest acute hazard

Grain dust, cereal dust and feed dust from wheat, corn, soy, barley, canola, rice, legume, meat meal, blood meal, feather meal, fish meal and bone meal are combustible particulate solids with Kst values typically in the 100 to 160 bar metres per second range — classified as a St 1 dust explosion class. Under AS/NZS 60079.10.2 (Explosive Atmospheres — Classification of Areas — Combustible Dust Atmospheres) and AS 3957 (Dust Hazard), the interior of the silo, pneumatic conveyor, bucket elevator, hammermill, pellet mill, dust collector, baghouse and cyclone is a Zone 21 hazardous area — dust cloud present in normal operation — and the exterior space around the equipment is Zone 22 — dust cloud present only abnormally. The NFPA 660 (2025) consolidated combustible particulate solids standard is the global authoritative reference and supersedes the legacy NFPA 654, NFPA 61 (agricultural dust), NFPA 484 (metal dust) and NFPA 664 (wood dust) into one unified standard.

The duct system engineering response is heavy-gauge bonded and grounded carbon steel or galvanised duct with bolted flanged connections, electrically continuous across every flange via copper bonding strap, explosion isolation valves at every transition between equipment, NFPA 68 deflagration vent panels on dust collectors and baghouses sized for the Kst value of the dust species, and intrinsically safe instrumentation throughout. The minimum explosible concentration MEC for grain dust is approximately 50 to 60 grams per cubic metre; the minimum ignition energy MIE is approximately 10 to 30 millijoules — well within the energy of a static discharge from an ungrounded duct section or a friction spark from a pneumatic conveyor impeller. The pet food industry has documented multiple historical dust explosion incidents globally including the catastrophic Imperial Sugar refinery explosion in 2008 (Port Wentworth GA, USA, fourteen fatalities, multi-billion dollar damages); the engineering controls in NFPA 660 are written against that incident lineage and the rendering plant Tallowman or feed mill operator cannot under any circumstances rely on dust suppression alone.

The dry kibble extruder envelope — NFPA 86 industrial oven

The dry kibble extrusion line at Mars Petcare Wodonga, Real Pet Food Co Ingleburn, Nestlé Purina Blayney and Hill's Pet Nutrition Australia runs at 200 to 500 kilograms per hour throughput across a Wenger, Buhler, Pavan or CPM California Pellet Mill extruder. The pre-conditioner injects steam and moisture at 90 to 100 degrees Celsius; the extruder barrel reaches 80 to 150 degrees Celsius under shear; the die plate cuts the expanded kibble into shape; the post-extrusion dryer runs counterflow air at 60 to 90 degrees Celsius for 15 to 25 minutes to drive moisture down to 8 to 10 percent; the counterflow cooler returns the kibble to ambient temperature; the vacuum coater spray-applies tallow, palatability enhancer and chicken or fish hydrolysate liquid. The HVAC duct envelope is engineered to NFPA 86 industrial oven standard for the dryer section — the dryer cabinet is a Class B industrial oven under NFPA 86 with combustion safety controls, purge cycle and overtemperature shutdown.

Supply air to the extruder hall is HEPA-filtered to MERV 13 minimum (some Mars Petcare and Hill's installations specify MERV 14 to support the prescription veterinary product line). Extract from the dryer is heavy-gauge stainless steel with continuous welded longitudinal seams. The cooler exhaust is a Zone 22 dust hazardous area under AS/NZS 60079.10.2 with NFPA 660 dust extraction. The coater extract handles aerosolised tallow mist and palatability enhancer flavour particulate — the duct walls accumulate fat deposit over the production cycle and require monthly hot-water flush sanitation. SBKJ supplies the dryer and cooler scope using the SBAL-V auto duct line in 304L stainless variant with the SBLR-600 longitudinal seam welder for continuous TIG seam construction.

Wet pet food retort canning — commercial sterility under saturated steam

Wet pet food retort sterilisation is engineered to commercial sterility F0 3 minimum under FSANZ-adjacent and AS 5812 guidance. The retort autoclave runs at 121 degrees Celsius for 30 to 60 minutes under saturated steam at 1 to 1.5 bar gauge. Containers include 3-piece tin can (legacy Whiskas, Pedigree, Royal Canin wet), 2-piece aluminium can (premium wet pet food product), aluminium pouch (Cesar dog pouches, Sheba cat pouches, Nature's Gift pouches) and aseptic stand-up pouch (Snappy Tom and premium specialist product). The HVAC duct envelope around the retort hall is 316L stainless throughout because of the saturated steam exposure, the chlorine-based CIP sanitation chemistry and the chloride load from the cooling water blowdown.

Steam vent ductwork is 316L with continuous welded seams and 30 degree minimum slope on horizontal runs to drain condensate. The can warmer pre-heat hood at 80 degrees Celsius, the retort steam vent stack discharging the autoclave purge cycle, the post-retort can cooler tunnel exhaust at 30 to 40 degrees and the seam-checker inspection extract at the labelling line are all dedicated duct branches with capture velocity 0.5 metres per second minimum at the source. Worker exposure standards for carbon monoxide from the LPG burner heating system (30 ppm 15-minute STEL), carbon dioxide from combustion (5000 ppm 8-hour TWA) and steam exposure are monitored continuously. SBKJ supplies the retort hall ductwork using the SBAL-V auto duct line in 316L stainless variant with the SB-ZF1500 stitchwelder for continuous TIG seam construction.

Rendering plant H2S and NH3 — three-stage odour control train

Pet food rendering operates cookers at 100 to 130 degrees Celsius and generates a vapour stream rich in volatile fatty acids, amines (trimethylamine, putrescine, cadaverine), hydrogen sulfide, mercaptans and ammonia. The H2S exposure standard of 10 ppm 8-hour TWA and 15 ppm 15-minute STEL is the single critical worker exposure parameter and H2S is the leading cause of acute fatalities in any rendering or animal-byproduct processing plant globally. H2S becomes acutely lethal at 200 to 300 ppm with no warning, because olfactory paralysis sets in at concentrations above 100 ppm and the worker can no longer detect the gas by smell. Ammonia at 25 ppm 8-hour TWA and 35 ppm 15-minute STEL is the secondary parameter. Amine compounds (trimethylamine, putrescine, cadaverine) are the dominant contributors to the perceived odour even though the H2S concentration is the regulatory-binding parameter.

The three-stage odour control train is the industry standard for any modern rendering plant: stage one is the chemical wet scrubber with sodium hypochlorite (NaOCl) or sodium hydroxide (NaOH) as the scrubbing chemistry, sized for the peak cooker vapour load with 25 percent safety margin; stage two is the activated carbon adsorber or, for the largest plants, the regenerative thermal oxidiser RTO at 800 to 900 degrees Celsius combustion temperature with three-vessel switching for thermal efficiency; stage three is the biofilter polish on the residual odour with engineered media bed (compost, peat or proprietary engineered media) and minimum 30 to 45 second empty-bed contact time. The discharge stack is sized for 1.5 metres per second minimum exit velocity and 3 metres minimum height above adjacent occupied buildings. Continuous H2S and NH3 monitoring with alarm at 5 ppm H2S and 15 ppm NH3 is the standard installed configuration. The ARA Australian Renderers Association publishes industry guidance on the odour control train and the state EPA Air Quality consent is the regulatory binding instrument. SBKJ supplies the rendering plant ductwork using the SBAL-V 316L stainless variant for the cooker hood capture and the scrubber inlet, and 309/310S high-temperature stainless for the RTO inlet, outlet and exhaust stack.

Ammonia refrigeration — pet food cold storage and IQF freezer

Pet food cold storage of raw meat ingredient, fresh chicken, fish and frozen byproduct uses R-717 ammonia refrigeration under AS/NZS 1677 Parts 1 to 4 (Refrigerating Systems — Safety, Design and Construction) and AS/NZS 5149 (Refrigerating Systems and Heat Pumps — Safety and Environmental Requirements). The IQF freezer for premium wet pet food product, Snappy Tom and Royal Canin Veterinary Diet runs at minus 25 to minus 35 degrees Celsius with R-717 ammonia direct expansion or pumped circulation. The compressor room is a Class I Zone 2 hazardous area under AS/NZS 60079.10.1 for the ammonia vapour cloud risk and is engineered to AS/NZS 1677 emergency ventilation requirements at 30 air changes per hour minimum.

The HVAC duct response is dedicated 316L stainless extract from the compressor room to a wet scrubber discharge, spark-resistant motor and damper actuator construction throughout the plant room, continuous ammonia monitoring with low-level alarm at 15 ppm and high-level shutdown at 25 ppm, and absolute prohibition of galvanised duct in any space where wet ammonia is possible. Galvanised steel under wet ammonia attack converts to zinc-ammonia complexes within months and the duct integrity is lost. Mars Petcare Wodonga, Real Pet Food Co Ingleburn, Nestlé Purina Blayney and Hill's Pet Nutrition Australia all run R-717 ammonia at industrial scale.

Pet pharmaceutical APVMA GMP — ISO 8 cleanroom envelope

APVMA Australian Pesticides and Veterinary Medicines Authority regulates pet pharmaceutical, veterinary medicine, vaccine and medicated pet food product under Veterinary Medicines registration. APVMA-registered manufacturing operates under TGA Therapeutic Goods Administration GMP Good Manufacturing Practice principles, ISO 13485 medical device quality management (where the product is registered as a medical device, for example diagnostic test kit), ISO 14644 cleanroom standard (typically ISO 8 for solid dose oral tablet and capsule and ISO 5 for aseptic injectable product), and ASHRAE 170 ventilation for healthcare facilities. Virbac Australia at Milperra NSW manufactures Drontal, Bravecto, Frontline, NexGard, Heartgard and Advocate; Vetafarm at Wagga Wagga manufactures BeneFlex joint health, Vetfood supplement and avian-specific veterinary product.

Pet pharmaceutical cleanroom HVAC duct is 316L stainless with welded longitudinal seams throughout, smooth-bore interior, HEPA-filtered supply at H13 or H14 grade with terminal HEPA at the cleanroom envelope, positive pressurisation cascade from the ISO 5 aseptic core outward, and dedicated extract at every operator interface station. The classification cascade typically runs ISO 5 (aseptic core) at plus 25 Pascals to ISO 7 (changing room) at plus 15 Pascals to ISO 8 (general cleanroom production) at plus 5 Pascals to unclassified (corridor) at neutral. The HVAC duct system supports the AS/NZS 60079 ATEX classification where flammable solvent handling occurs (acetone, isopropanol cleaning fluid).

Grain reception, silo storage and pneumatic conveying — Zone 21 hazardous area

The pet food and animal feed manufacturing plant starts at the grain reception bay where bulk wheat, corn, soy, barley, canola, rice and legume ingredient arrives by road train or rail. The reception pit, the bucket elevator to the silo, the silo interior, the pneumatic conveyor between silo and mixer, and the dust collector on the receiving aspirate are all Zone 21 hazardous areas under AS/NZS 60079.10.2 because dust cloud is present in normal operation. The duct system serving this scope is heavy-gauge bonded and grounded galvanised carbon steel or carbon steel with bolted flanged connections, electrically continuous across every flange via copper bonding strap. The minimum duct material thickness for grain dust extraction is typically 1.5 to 2.0 millimetres — not because of mechanical loading but because of the abrasion resistance required against grain particulate impingement at the conveyor and elbow sections.

The aspirate dust collector and baghouse on the reception scope are engineered to NFPA 660 (2025) combustible particulate solids standard with NFPA 68 deflagration vent panels on the housing sized for the Kst value of the dust species (typically 100 to 130 bar metres per second for wheat dust, 120 to 160 for soy dust). Explosion isolation valves at the inlet duct prevent flame propagation back into the silo and conveyor system in the event of a deflagration in the dust collector. The Australian standard AS 3957 dust hazard parallels the NFPA framework and is the binding reference in Australian regulatory enforcement.

The Mars Petcare Wodonga site, the Real Pet Food Co Ingleburn site, the Nestlé Purina Blayney site and the Ridley Corporation pellet mill network all run the grain reception envelope at Zone 21 internal and Zone 22 external with full NFPA 660 engineering controls. SBKJ supplies the grain handling dust extraction duct using the SBFB-1500 spiral fitting machine for round-spiral duct in galvanised heavy-gauge coil and the SBPC1500 plasma cutter in spark-resistant configuration for plate prep on the dust collector housing and the cyclone separator.

Milling, grinding and hammermill — the dust generation epicentre

Downstream of the silo storage sits the milling and grinding zone where grain ingredient is reduced to flour and meal grist for the kibble extrusion line. Hammermill (Buhler, ProMan, Bliss), roller mill (Roskamp) and pellet mill conditioner (Andritz, CPM California Pellet Mill) are the dominant equipment classes. The aspirate system serving each mill is the dust generation epicentre of the plant — cyclone separator, baghouse and pulse-jet filter cartridge dust collector running in parallel banks at the larger sites. The capture velocity at the mill discharge is 1.0 to 1.5 metres per second to prevent dust escape into the workspace; the duct transport velocity is 18 to 22 metres per second to maintain particle suspension in the duct without deposition.

The duct material is heavy-gauge galvanised or carbon steel 1.5 to 2.0 millimetres with bolted flanged construction throughout, electrically continuous, with explosion isolation valves at every transition and NFPA 68 deflagration vent panels on every collector and baghouse. The cyclone separator on the secondary aspirate is dedicated 304L stainless for the larger sites where corrosion of the spinning vortex zone is a maintenance liability. The PFIAA Pet Food Code of Practice CoP and the AS 5812 manufacturing requirement reference the dust extraction effectiveness as a HACCP control point because elevated dust load in the production environment is a microbiological contamination risk and an audit non-conformance.

Mixing, batching and ingredient metering

Downstream of the milling zone sits the mixer and batching station where flour, meal, vitamin premix, mineral premix, animal byproduct (meat meal, blood meal, feather meal, fish meal, bone meal) and liquid ingredient are combined per the formulation recipe. Ribbon mixer, paddle mixer, Sigma blade mixer and Z-blade blender are the dominant equipment classes. Bag dump stations, FIBC (Flexible Intermediate Bulk Container) unload stations and liquid metering are the operator interfaces. The HVAC duct response is dedicated local exhaust ventilation LEV at every dump and metering station with capture velocity 0.5 to 1.0 metres per second at the operator face per the ACGIH Industrial Ventilation Manual.

The aspirate is routed via dedicated heavy-gauge galvanised duct to a dust collector and discharged to atmosphere after filtration. The respirable particulate exposure standard of 5 milligrams per cubic metre 8-hour TWA and inhalable particulate standard of 10 milligrams per cubic metre 8-hour TWA are the regulatory binding parameters; the formaldehyde STEL of 1 ppm (referenced because some vitamin premix and chemical preservative use formaldehyde derivatives) is monitored at the operator face. The mixer hall floor and surfaces are sloped to drain to a dedicated wash sump and the daily sanitation cycle uses food-grade chlorinated alkaline foam at 60 to 80 degrees Celsius CIP cycle.

Dry kibble extrusion — the production heart of every major pet food plant

The dry kibble extrusion line is the production heart of every major pet food plant in Australia. Mars Petcare Wodonga, Real Pet Food Co Ingleburn, Nestlé Purina Blayney and Hill's Pet Nutrition Australia all run the Wenger or Buhler twin-screw extruder configuration with throughput at 200 to 500 kilograms per hour per line and parallel banks of two to four lines per site for the major brands. The extrusion process flow is: pre-conditioner (steam and moisture injection at 90 to 100 degrees Celsius, dough conditioning); twin-screw extruder barrel (80 to 150 degrees Celsius under shear, expansion and texturisation); die plate (cut to kibble shape); knife rotation (length cut); post-extrusion dryer (counterflow air at 60 to 90 degrees Celsius, 15 to 25 minute residence time, moisture to 8 to 10 percent); counterflow cooler (ambient air, return to room temperature); vacuum coater (tallow, palatability enhancer, chicken or fish hydrolysate liquid spray).

The extruder hall HVAC envelope

The extruder hall is conditioned to 18 to 24 degrees Celsius at 40 to 60 percent RH to maintain operator comfort and to control condensate accumulation on cold steel surfaces. Supply air is HEPA-filtered to MERV 13 minimum (some Mars Petcare and Hill's installations specify MERV 14 to support the prescription veterinary product line). The extruder barrel itself is the heat source and the room sensible heat load is dominated by the extruder motor and the dryer cabinet conductive and radiant heat. The duct material is 304L stainless throughout the extruder hall because of the steam exposure from the pre-conditioner vent, the chloride load from the daily wash-down and the aerosolised tallow from the coater extract.

The dryer extract — NFPA 86 industrial oven

The post-extrusion dryer is engineered to NFPA 86 (Standard for Ovens and Furnaces) Class B industrial oven with combustion safety controls, purge cycle, overtemperature shutdown and explosion relief vent. The combustion fuel is typically LPG (Liquefied Petroleum Gas) or natural gas with carbon monoxide emission control to the 30 ppm STEL workplace exposure standard. The dryer extract is heavy-gauge 304L stainless steel with continuous welded longitudinal seams via the SBLR-600 longitudinal seam welder. The extract air is laden with kibble dust, water vapour and combustion product (carbon dioxide, water vapour, trace nitrogen oxides). The discharge stack is sized for 1.5 metres per second minimum exit velocity and 3 metres above the adjacent roof.

The dryer cabinet purge cycle is critical — before ignition of the burner each cycle, the cabinet is purged with at least four air changes of fresh air to displace any residual combustible mixture from the previous cycle. Combustion safety control monitors the burner flame proof, the gas supply pressure, the air supply pressure differential across the cabinet and the cabinet temperature; loss of any safety condition triggers automatic shutdown and lockout. The combustion safety control is a dedicated PLC programme separate from the production PLC. NFPA 86 is the global authoritative reference and the Mars Petcare, Real Pet Food Co and Nestlé Purina installations all comply.

The cooler exhaust — Zone 22 dust hazardous area

The counterflow cooler returns the dried kibble to ambient temperature with parallel-flow ambient air drawn through the bed. The cooler exhaust is laden with kibble dust and fines from the kibble surface abrasion as the product tumbles through the cooler. The cooler exhaust is a Zone 22 dust hazardous area under AS/NZS 60079.10.2 with NFPA 660 dust extraction. The dust collector on the cooler exhaust is sized for the cooler airflow plus 20 percent safety margin and is engineered with NFPA 68 deflagration vent panels on the housing.

The coater extract — aerosolised tallow and palatability enhancer

The vacuum coater spray-applies tallow, palatability enhancer (typically liquid digest from animal byproduct) and chicken or fish hydrolysate to the surface of the dried kibble at 60 to 80 degrees Celsius. The coater extract handles aerosolised tallow mist and palatability enhancer flavour particulate — the duct walls accumulate fat deposit over the production cycle and require monthly hot-water flush sanitation. The duct material is 304L stainless with continuous welded longitudinal seams. Capture velocity at the coater extract is 1.0 metres per second minimum. The extract discharges through a fat filter (typically a mesh impingement type with hot-water CIP capability) before the main extraction fan.

Wet pet food retort canning — Mars Petcare Wodonga and Snappy Tom

The wet pet food retort canning hall is the second major production envelope in the integrated pet food plant. Mars Petcare Wodonga runs the dominant Australian wet pet food retort line, producing Whiskas wet, Pedigree wet, Royal Canin wet, Sheba premium wet, Cesar dog pouches, Dine wet and Optimum wet. Real Pet Food Co Ingleburn runs the Nature's Gift wet, VIP wet pouches and the Snappy Tom premium cat wet line. Nestlé Purina Blayney runs the Fancy Feast premium wet, Felix wet, Friskies wet and Pro Plan wet. The retort canning envelope is an entirely separate building zone from the dry kibble extrusion line due to the different temperature, humidity, materials handling and worker exposure requirements.

The can filling and lid seam line

The can filling line operates at ambient temperature with the wet pet food slurry (cooked meat, gravy, vegetable, vitamin and mineral premix) filled into 3-piece tin can, 2-piece aluminium can, aluminium pouch or aseptic stand-up pouch via volumetric filler or weight-checker filler. The lid seam (3-piece can) or end seal (pouch) is the critical quality gate. Continuous online vision inspection and seam-checker on every container. The HVAC envelope is conditioned to 18 to 22 degrees Celsius with positive pressurisation at plus 15 Pascals to maintain ingress prevention. Supply air is HEPA-filtered to MERV 13 minimum.

The can warmer pre-heat hood

Some retort lines pre-heat the filled and sealed can to 60 to 80 degrees Celsius in a can warmer tunnel immediately upstream of the retort autoclave to reduce the autoclave cycle time. The can warmer pre-heat hood operates at 80 degrees with steam injection and the extract duct is 316L stainless with continuous welded longitudinal seam. Capture velocity at the hood is 0.5 metres per second minimum.

The retort autoclave

The retort autoclave is the commercial sterility envelope. Operating at 121 degrees Celsius for 30 to 60 minutes under saturated steam at 1 to 1.5 bar gauge, the autoclave delivers a thermal load equivalent to F0 3 minimum to achieve commercial sterility. The autoclave purge cycle vents to atmosphere via a dedicated steam vent stack in 316L stainless with continuous welded longitudinal seam and 30 degree minimum slope on horizontal runs to drain condensate. The discharge stack is 3 metres above the adjacent roof.

The retort hall ambient is conditioned to 22 to 26 degrees Celsius with elevated humidity from the steam load. The duct material throughout the retort hall is 316L stainless because of the saturated steam exposure, the chlorine-based CIP sanitation chemistry and the chloride load from the cooling water blowdown. SBKJ supplies the retort hall ductwork using the SBAL-V auto duct line in 316L stainless 1.2 to 1.5 millimetre variant with the SB-ZF1500 stitchwelder for continuous TIG seam construction. The Mars Petcare Wodonga wet pet food line, the Real Pet Food Co Snappy Tom retort line and the Nestlé Purina Fancy Feast wet line all run this envelope.

The post-retort cooler tunnel

Immediately downstream of the autoclave, the sterilised cans are cooled in a counterflow cooler tunnel from 121 degrees Celsius back to 30 to 40 degrees Celsius using cooling water at 12 to 18 degrees. The cooling water is the chloride source — municipal supply with chlorine residual at 0.5 to 1.0 milligrams per litre, treated with sodium hypochlorite at the cooler intake for microbial control. The cooler tunnel exhaust is 316L stainless because of the chloride exposure. The cooler exhaust is sized for the steam evaporation load from the can surface as the cans cool below 100 degrees Celsius.

The seam-checker inspection extract

The seam-checker on the labelling line is the final quality gate. Continuous vision inspection and torque check on every can. The seam-checker extract handles aerosolised gravy and meat slurry from any leaker cans rejected at the inspection. The duct material is 316L stainless and the capture velocity is 0.5 metres per second minimum.

Treats and dental chews — Schmackos, Greenies, Dentastix, Whimzees

The treats and dental chews production hall combines baked oven processing (Schmackos, Greenies dental chew baked products), extruded treats (Dentastix extruded chew, Whimzees moulded chew), thermoformed product (Greenies dental chew specialty shapes) and vacuum-formed packaging. The baked oven is engineered to NFPA 86 industrial oven Class B with the same combustion safety control envelope as the dry kibble dryer. Operating temperature 60 to 150 degrees Celsius depending on product. The Mars Petcare Wodonga site produces Schmackos and Greenies on dedicated lines adjacent to the dry kibble extrusion hall.

The dental chew extrusion line at Greenies uses a specialty extruder with starch-based formulation and texturisation control to produce the characteristic dental chew shape. The HVAC envelope is 304L stainless throughout, conditioned to 18 to 22 degrees Celsius at 40 to 60 percent RH, with HEPA-filtered supply at MERV 13 and dedicated extract on the oven exhaust at 316L stainless because of the elevated combustion product exposure. The Whimzees moulded chew line uses thermoforming with a heated plastic film (typically polylactic acid PLA or modified starch) drawn over a mould; the thermoforming station extract handles low-level VOC emission from the film material.

Bird feed and aviculture — Vetafarm Wagga Wagga

The bird feed manufacturing envelope at Vetafarm Wagga Wagga combines specialist seed-mix blending (sunflower, millet, canary seed, niger, safflower), pellet extrusion for parrot pellet product, hand-rearing formula production for breeders, probiotic and vitamin-mineral premix manufacturing and APVMA-registered veterinary product manufacturing (BeneFlex joint health, Vetfood supplement, avian-specific veterinary product). The site is one of the largest specialist bird feed sites in Australia and supports the export aviculture market.

The HVAC duct envelope combines grain and seed dust hazardous area engineering (Zone 22 under AS/NZS 60079.10.2 with NFPA 660 dust extraction throughout the seed handling, hammermill, pellet press and extrusion line scope) with the AQIS biosecurity requirements for Newcastle disease and HPAI (Highly Pathogenic Avian Influenza) bird flu prevention. The Australian Pesticides and Veterinary Medicines Authority APVMA registration covers the veterinary product side and triggers cleanroom-adjacent envelope on the relevant product line. Seed mix processing generates respirable seed dust at 5 milligrams per cubic metre WES inhalable and grain dust at 10 milligrams per cubic metre WES inhalable.

The hand-rearing formula and specialist parrot pellet product line operates with HEPA-filtered supply and dedicated extract to prevent cross-contamination — in particular, AQIS biosecurity prevents cross-contamination between native Australian bird species product (cockatoo, parrot, finch native) and exotic species product. The HVAC duct material is heavy-gauge galvanised with bolted flanged construction in the dust extraction system serving the hammermill and seed processing, 304L stainless in the pellet press and extrusion zone, and HEPA-filtered supply with smooth-bore 304L stainless ductwork in the hand-rearing formulation room.

Aquarium and pond fish food — Aquasonic, Sera, Tetra, Hikari

The aquarium food manufacturing envelope at Aquasonic and the imported product distribution at Sera, Tetra and Hikari adds AQIS biosecurity controls on top of the standard pet food manufacturing framework. Product formats include flake (extruded thin sheet, dried, cut to flake), pellet (extruded floating or sinking pellet), stick (extruded longer-form pellet), wafer (compressed disc), tablet (compressed disc with bottom-feeder formulation) and live food (brine shrimp Artemia, moina, daphnia). The live-food production hall operates as a separate clean envelope to prevent cross-contamination with the dry product line. Aquasonic at the Australian manufacturing site runs dedicated 304L stainless duct in the extrusion and dryer zone and HEPA-filtered supply in the live-food production hall.

Livestock feed pellet mill — Ridley Corporation and Coprice Riverina

The livestock feed pellet mill envelope at Ridley Corporation ASX:RIC, Coprice Riverina, Riverina Stockfeeds, Wagga Stockfeeds and Lienert Australia is the dominant non-pet animal feed manufacturing sector in Australia. The product portfolio covers dairy ruminant feed, poultry layer and broiler feed, pig feed, sheep ruminant feed, beef ruminant feed, horse feed and aquaculture feed. The pellet mill envelope is a textbook Zone 22 dust hazardous area under AS/NZS 60079.10.2 with NFPA 660 combustible particulate solids engineering throughout. The cereal grain dust, vegetable meal dust, animal feed dust and pellet fines have Kst values in the 100 to 160 bar metres per second range; the deflagration vent panel sizing on the dust collector, baghouse and cyclone follows NFPA 68 calculations.

APVMA-registered medicated premix (ionophore-class antibiotic for ruminant including monensin and lasalocid, anti-coccidial for poultry, anthelmintic for sheep and beef) is added at the mixer station and triggers tighter operator exposure control under SafeWork Australia chemical handling guidance. The medicated premix dispensing station operates as a dedicated dust extraction envelope with HEPA-filtered extract before atmosphere release, dedicated PPE for the operator (P2 respirator minimum) and locked storage for the premix product.

The HVAC duct material is heavy-gauge galvanised throughout the dust extraction system serving the silo, conveyor, hammermill, mixer, pellet mill conditioner, pellet mill die and cooler with bolted flanged construction, electrically bonded and grounded at every flange, with explosion isolation valves at every equipment transition. The Ridley Corporation pellet mill at Cottesloe (poultry), the Coprice Riverina ruminant feed mill, the Lienert Australia premix manufacturing site and the Riverina Stockfeeds mills all run equivalent envelopes. SBKJ supplies the livestock feed pellet mill ductwork using the SBFB-1500 spiral fitting machine and the SBAL-V auto duct line in heavy-gauge galvanised variant.

Pet food rendering — the most aggressive odour-emission process in the chain

Pet food rendering — the production of meat meal, blood meal, feather meal, fish meal, bone meal and tallow from slaughter byproduct — is the most aggressive odour-emission process in the entire pet food supply chain. The vapour stream from rendering cookers at 100 to 130 degrees Celsius is rich in volatile fatty acids, amines (trimethylamine, putrescine, cadaverine), hydrogen sulfide, mercaptans and ammonia. The Australian Renderers Association ARA represents the rendering plant operators and publishes industry guidance on odour control. The state EPA Air Quality consent is the regulatory binding instrument. The Pet Food Industry Association of Australia PFIAA references the rendering plant ingredient quality envelope through the Pet Food Code of Practice CoP.

The cooker capture hood

The rendering cooker is the dominant odour source. Cooker type includes batch cooker (older sites, 1 to 3 hour batch cycle), continuous cooker (larger modern sites, continuous feed and product discharge) and pressure cooker (specialty applications). The cooker capture hood is dedicated 316L stainless with continuous welded longitudinal seam, sized for capture velocity 1.0 metres per second minimum at the cooker discharge face. The hood discharges to the stage one wet scrubber via 316L stainless duct with 30 degree minimum slope on horizontal runs to drain condensate.

Stage one — chemical wet scrubber

The stage one wet scrubber is typically a packed-bed counter-current scrubber with sodium hypochlorite (NaOCl) at 5 to 10 percent active chlorine concentration or sodium hydroxide (NaOH) at pH 10 to 12 as the scrubbing chemistry. The scrubber is sized for the peak cooker vapour load with 25 percent safety margin. The scrubber housing is 316L stainless or FRP (fibre-reinforced plastic) construction. The scrubber inlet duct is 316L stainless and the scrubber outlet duct is similar.

Stage two — activated carbon adsorber or regenerative thermal oxidiser RTO

The stage two odour control is either an activated carbon adsorber (for smaller plants with moderate odour load) or a regenerative thermal oxidiser RTO (for larger plants with continuous high odour load). The RTO is the most effective single-stage odour control technology and operates at 800 to 900 degrees Celsius combustion temperature with three-vessel switching for thermal efficiency (typically 90 to 95 percent thermal energy recovery). The RTO inlet, outlet and exhaust stack are engineered in 309/310S high-temperature stainless steel because of the elevated operating temperature. The RTO exhaust stack discharge is essentially carbon dioxide, water vapour and trace nitrogen oxides; the H2S, NH3 and amine compound destruction is greater than 99 percent on a well-designed RTO.

Stage three — biofilter polish

The stage three biofilter polish handles the residual odour after the wet scrubber and the adsorber or RTO. The biofilter is an engineered media bed (compost, peat or proprietary engineered media including wood chip, bark and inert support) with minimum 30 to 45 second empty-bed contact time. The biofilter operates at ambient temperature with humidified air to maintain biological activity in the media. Discharge from the biofilter is essentially odour-neutral and is released to atmosphere via a low-velocity dispersal stack.

Continuous monitoring

Continuous H2S and NH3 monitoring at the cooker hood, at the scrubber inlet, at the scrubber outlet, at the adsorber or RTO outlet and at the biofilter outlet is the standard installed configuration. Alarm at 5 ppm H2S and 15 ppm NH3 with shutdown at 10 ppm H2S and 25 ppm NH3. The dossier on each measurement station is maintained for the EPA Air Quality consent compliance. SBKJ supplies the rendering plant ductwork using the SBAL-V 316L stainless variant for the cooker hood capture and the scrubber inlet, and 309/310S high-temperature stainless for the RTO inlet, outlet and exhaust stack.

Pet pharmaceutical manufacturing — APVMA, GMP and ISO 8 cleanroom

The pet pharmaceutical manufacturing envelope at Virbac Australia (Milperra NSW) and Vetafarm (Wagga Wagga NSW) is engineered to TGA GMP principles equivalent to a human pharmaceutical facility. APVMA Australian Pesticides and Veterinary Medicines Authority regulates the product registration and the manufacturing site inspection. The cleanroom envelope is ISO 14644 (most commonly ISO 8 for solid dose oral tablet, capsule, chewable; ISO 7 for the secondary changing room; ISO 5 for the aseptic core where injectable, ophthalmic or sterile product is filled).

Cleanroom HVAC duct construction

Pet pharmaceutical cleanroom HVAC duct is 316L stainless with welded longitudinal seams throughout, smooth-bore interior, HEPA-filtered supply at H13 or H14 grade with terminal HEPA at the cleanroom envelope. The supply duct downstream of the terminal HEPA is dead-leg free with no internal lining or insulation. Return air is via low-level return at the cleanroom perimeter at neutral or slightly negative pressure to the cleanroom interior. Pressurisation cascade typically runs ISO 5 (aseptic core) at plus 25 Pascals, ISO 7 (changing room) at plus 15 Pascals, ISO 8 (general cleanroom production) at plus 5 Pascals and unclassified (corridor) at neutral.

Product line scope — Virbac and Vetafarm

Virbac at Milperra NSW manufactures Drontal (worming, oral tablet and chewable), Bravecto (parasite control, chewable), Frontline (flea and tick, topical spot-on), NexGard (parasite, chewable), Heartgard (heartworm prevention, chewable), Advocate (flea and worm combination, topical spot-on) and the broader veterinary pharmaceutical portfolio. The product portfolio spans oral solid dose (tablet, capsule, chewable), topical (spot-on, spray), injectable (subcutaneous, intramuscular) and feed-additive premix. Each product format triggers a different cleanroom classification and a different HVAC envelope.

Vetafarm at Wagga Wagga manufactures BeneFlex (joint health supplement, oral powder), Vetfood (supplement, oral powder and chewable), avian-specific veterinary product (probiotic, vitamin-mineral premix for parrot, finch and aviary). Vetafarm's cleanroom envelope is co-located with the bird feed manufacturing site at Wagga Wagga, with strict separation between the bird feed production and the APVMA-registered veterinary product line.

The aseptic core and the injectable product line

The aseptic core for injectable product manufacturing is ISO 5 (Class 100 in the legacy Federal Standard 209E nomenclature) with HEPA-filtered laminar flow at 0.45 metres per second velocity at the working height. The product fill machine, the lyophiliser (freeze-dryer), the autoclave for sterilisation of bulk container and equipment, and the depyrogenation oven for glass vial sterilisation are all in or directly adjacent to the aseptic core. The HVAC duct envelope is 316L stainless with continuous welded longitudinal seams throughout, supplied via terminal HEPA H14 at the room ceiling and extracted via low-level return at the perimeter.

Vet clinic prescription food dispensary — Royal Canin Veterinary and Hill's Prescription Diet

The vet clinic prescription food dispensary — the back-of-house storage and dispensing of Royal Canin Veterinary Diet, Hill's Prescription Diet and the equivalent Pro Plan Veterinary Diet at the consulting veterinarian level — is a smaller scale HVAC envelope but is included here for completeness. The product range covers therapeutic and maintenance veterinary nutrition: diabetic, renal, urinary, joint, skin, digestive and recovery diet for dog and cat. The dispensary is conditioned to 18 to 22 degrees Celsius with humidity at 40 to 60 percent RH. Allergen segregation between product formulations is maintained via dedicated storage shelving and HVAC supply per zone if the dispensary is large enough. Galvanised duct is acceptable in this scope because the corrosion exposure is moderate.

Insect protein pet food — Loop Farms and Aussie Crickets

The emerging insect protein alternative pet food segment at Loop Farms and Aussie Crickets in Australia represents the future of sustainable pet food protein. House cricket, black soldier fly larvae and mealworm are the three leading species. The cricket farm envelope adds controlled humidity (60 to 80 percent RH), controlled temperature (28 to 32 degrees Celsius for cricket; 22 to 28 degrees for black soldier fly larvae), ammonia management from cricket excreta and frass droppings collection and management to the standard pet food manufacturing envelope.

The HVAC duct system is 304L stainless throughout because of the elevated humidity and the ammonia exposure. Continuous ammonia monitoring is required because the cricket and larvae enclosure ammonia load can reach 25 ppm in the breathing zone if ventilation is insufficient. The frass collection and processing zone is a Zone 22 dust hazardous area when the frass is dried and ground for blend into the finished pet food product. NFPA 660 dust extraction applies. This segment is small but growing and engineering is in the early-adopter phase.

SBKJ machine selection for the Australian pet food and animal feed sector

SBKJ supplies five core machine classes to the Australian pet food, animal feed, rendering and pet pharmaceutical sectors:

SBAL-V auto duct line

The SBAL-V is SBKJ's flagship auto duct line for rectangular duct fabrication and is supplied in four variant tracks for the Australian pet food sector:

• SBAL-V galvanised 0.8-1.2mm — the standard configuration for dry-zone supply HVAC, supply air to the extruder hall, return air ductwork in the ambient-temperature production zones and the dry plant rooms where chloride and chemistry exposure is moderate. Used at Ridley Corporation pellet mills and the Coprice Riverina ruminant feed mill on the supply HVAC scope.
• SBAL-V 304L stainless 1.0-1.2mm — the standard for the dry kibble extruder hall, the treats and dental chew baking line and the bird feed pellet press zone where chloride exposure is moderate but stainless is required for sanitation and corrosion. Used at Mars Petcare Wodonga, Real Pet Food Co Ingleburn, Nestlé Purina Blayney, Hill's Pet Nutrition, Schmackos and Greenies treats lines, Vetafarm Wagga Wagga.
• SBAL-V 316L stainless 1.2-1.5mm — the standard for the wet pet food retort canning hall, the ammonia refrigeration plant room, the rendering plant cooker hood and scrubber discharge, the pet pharmaceutical APVMA cleanroom and the IQF freezer for raw meat ingredient. Used at Mars Petcare Wodonga wet line, Snappy Tom retort line, Nestlé Purina Fancy Feast wet line, Australian Renderers Association member rendering plants, Virbac Australia Milperra cleanroom, Vetafarm APVMA-registered product line.
• SBAL-V carbon steel heavy-gauge 1.5-2.0mm — the standard for grain handling dust extraction duct where mechanical abrasion resistance is the priority. Used at Ridley Corporation, Coprice Riverina and the Vetafarm seed handling scope. The SBAL-V at heavy-gauge handles the abrasion resistance demand of grain particulate impingement at conveyor and elbow sections.

SBAL-III auto duct line

The SBAL-III is the higher-throughput auto duct line variant for the largest Australian pet food sites. The SBAL-III adds dual-coil capability and can run a galvanised dry-zone coil and a 304L stainless production-zone coil in alternation without tooling changeover. The Mars Petcare Wodonga site, the Nestlé Purina Blayney site and the Ridley Corporation Cottesloe site are candidates for the SBAL-III configuration for the combined dry-zone-plus-stainless duct fabrication scope.

SBSF-1525 round duct flanger

The SBSF-1525 round duct flanger forms the inlet and outlet flanges on round-spiral duct for the grain handling dust extraction system, the dryer extract, the cooler exhaust, the coater extract, the rendering plant cooker hood capture and the IQF freezer evaporator coil plenum connections. The flange forming is critical because the bolted flanged connection is the standard electrically continuous connection in the Zone 21/22 hazardous area scope and the welded seam is the standard in the wet stainless scope.

SB-ZF1500 stitchwelder

The SB-ZF1500 stitchwelder produces continuous TIG seam construction on rectangular and round duct sections for the wet stainless scope. The retort hall ductwork, the rendering scrubber discharge, the ammonia plant room duct and the pet pharmaceutical cleanroom duct all use continuous welded longitudinal seam in 316L stainless. The SB-ZF1500 is the essential machine for the welded-seam scope and the SBLR-600 longitudinal seam welder is the secondary option for in-shop seam welding on rolled-and-formed duct sections up to 6 metres long.

SBFB-1500 spiral fitting machine

The SBFB-1500 spiral fitting machine produces round-spiral duct from 100 to 1500 millimetre diameter in continuous spiral construction. Used extensively for the grain and feed dust extraction system at Ridley Corporation, Coprice Riverina and Vetafarm; for the dryer and cooler exhaust at Mars Petcare Wodonga, Real Pet Food Co Ingleburn and Nestlé Purina Blayney; for the rendering plant cooker hood transfer duct; and for the IQF freezer return air ductwork. The spiral construction with circumferential ribs gives excellent rigidity at lower material thickness compared with rectangular duct and is the preferred construction for the high-velocity dust extraction system.

SBPC1500 plasma cutter — spark-resistant configuration for Zone 21/22 hazardous area

The SBPC1500 plasma cutter prepares plate for plenum and large-section fabrication. Material galvanised, 304L stainless, 316L stainless or carbon steel up to 12 millimetres thick. Plasma cutting accuracy plus or minus 0.5 millimetre; edge quality suitable for direct TIG or MIG welding without secondary machining. The spark-resistant configuration is critical for plate prep work in the grain handling dust extraction system, the dust collector housing fabrication, the cyclone separator fabrication, the rendering plant cooker hood fabrication, the ammonia compressor room scrubber housing and the IQF freezer evaporator coil plenum — these are Zone 21, Zone 22 or Class I Zone 2 hazardous areas under AS/NZS 60079 and the plasma cutter sparking is a documented ignition source if used inside the hazardous area without precautions. SBKJ supplies the SBPC1500 with the spark-resistant tooling kit for hazardous area fabrication.

SBLR-600 longitudinal seam welder

For in-shop seam welding on rolled-and-formed duct sections, the SBLR-600 longitudinal seam welder produces continuous TIG seams on sections up to 6 metres long. Output suitable for the largest pet food plant plenum sections, the rendering plant cooker capture extract trunk, the ammonia compressor room scrubber discharge ductwork and the RTO inlet and outlet ductwork. The longitudinal seam welder is essential for the wet pet food and rendering scope where continuously welded seams replace stitch-welded or lock-seam construction in the HACCP-critical and EPA-critical zones.

SBTF-1500 / 1602 / 2020 spiral tubeformer

The SBTF spiral tubeformer produces continuous spiral duct from coil at three diameter capacity tracks: SBTF-1500 to 1500 millimetre diameter, SBTF-1602 to 1600 millimetre diameter and SBTF-2020 to 2000 millimetre diameter. The Mars Petcare Wodonga site, the Real Pet Food Co Ingleburn site and the Nestlé Purina Blayney site all run large-section spiral duct in the supply HVAC scope to the extrusion hall and the retort hall; the SBTF-1602 at 304L stainless is the typical configuration for the larger sites.

The combined SBKJ machinery footprint for a major Australian pet food plant

The combined SBKJ machinery footprint for a major integrated Australian pet food plant project (Mars Petcare Wodonga expansion, Real Pet Food Co Ingleburn second line, Nestlé Purina Blayney brownfield, Hill's Pet Nutrition Sydney scientific diet) is typically: one SBAL-V stainless 304L line for the extruder hall rectangular duct, one SBAL-V stainless 316L line for the retort hall and rendering scope, one SBAL-V galvanised line for the dry-zone scope and grain handling dust extraction (or one dual-coil SBAL-III), one SBTF-1602 spiral tubeformer with multi-material capability (galvanised, 304L stainless, 316L stainless), one SBFB-1500 spiral fitting machine, one SBSF-1525 round flanger, one SB-ZF1500 stitchwelder, one SBPC1500 plasma cutter in spark-resistant configuration, and one SBLR-600 longitudinal seam welder.

The combined output capacity supports a 5,000 to 15,000 square metres per month duct fabrication rate, sufficient for the largest greenfield integrated pet food plant build, the Ridley Corporation pellet mill expansion programme, or the parallel SBKJ-supplied refit programmes at Vetafarm Wagga Wagga and the Australian Renderers Association member rendering plants. For a smaller specialist site (Stay Loyal, ZIWI Australia, Loop Farms cricket processing) the machinery footprint scales to one SBAL-V stainless line, one SBTF-1500 spiral, one SBFB-1500 fitting machine, one SBSF-1525 flanger and one SB-ZF1500 stitchwelder.

Common specification mistakes — what we see fail in the field

Mistake 1 — Galvanised ductwork in the wet pet food retort hall

The single most expensive value-engineering decision we see in the pet food sector. Galvanised G275 ductwork in the retort hall corrodes through the zinc layer in 12 to 24 months under the compound exposure of saturated steam from the autoclave purge, chlorine-based CIP sanitation chemistry, chloride load from the cooling water blowdown and aerosolised meat slurry from the seam-checker rejects. Replacement involves shutting the retort line down for the duct replacement window, which on a Mars Petcare Wodonga or Snappy Tom retort line is a multi-million-dollar production loss before any duct contractor is invoiced. The 316L stainless premium at procurement is approximately 4 to 5 times the galvanised cost; the avoided replacement loss and the avoided PFIAA audit non-conformance is two orders of magnitude larger.

Mistake 2 — Insufficient deflagration vent panel sizing on the dust collector

The single most catastrophic engineering error we see in the dry kibble and feed mill sector. Under-sized NFPA 68 deflagration vent panels on the dust collector or baghouse cannot relieve the pressure rise from a grain dust deflagration fast enough; the housing fails structurally and the deflagration propagates back into the connected ductwork and equipment. The Imperial Sugar refinery explosion in Port Wentworth GA, USA in 2008 (fourteen fatalities) is the cautionary lineage. The Kst value of the dust species drives the vent area calculation; oversize by 25 percent to provide engineering margin. NFPA 68 is the global authoritative reference and AS 3957 is the binding Australian standard.

Mistake 3 — Galvanised ductwork in the ammonia compressor room

Galvanised steel under wet ammonia attack converts to zinc-ammonia complexes within months and the duct integrity is lost. The ammonia compressor room is a Class I Zone 2 hazardous area under AS/NZS 60079 with a worker safety risk that demands 316L stainless ductwork throughout, spark-resistant motor and damper actuator construction, and continuous ammonia monitoring with two-stage alarm. Cost-engineering to galvanised in this room is a worker safety risk.

Mistake 4 — Shared HVAC return air between dry kibble and wet pet food halls

A common AS 5812 audit non-conformance. Return air ductwork that crosses between the dry kibble extrusion hall and the wet pet food retort hall is a documented cross-contamination vector and is a critical audit finding under the PFIAA Pet Food Code of Practice CoP and the ISO 22000 HACCP framework. Specify dedicated supply and exhaust per zone at design stage; retrofitting separation costs 3 to 5 times the design-stage cost.

Mistake 5 — Under-sized rendering plant odour control train

State EPA Air Quality consent failures on rendering plant operation almost always trace to undersized wet scrubber, undersized adsorber or RTO, undersized biofilter, or all three in combination. Size the wet scrubber for the peak cooker load with 25 percent safety margin; size the RTO for 800 to 900 degrees Celsius operating temperature with three-vessel switching at 90 to 95 percent thermal recovery efficiency; size the biofilter for 30 to 45 second empty-bed contact time. The ARA Australian Renderers Association guidance covers the methodology in detail.

Mistake 6 — Internal duct insulation in the production zones

Internal insulation in any production-zone supply duct accumulates aerosolised protein, fat, tallow and condensate over the production cycle and becomes a microbiological reservoir within the first sanitation cycle. The Listeria and Salmonella audit findings on Australian pet food plants over the last decade have repeatedly traced back to internally insulated ductwork. Specify external insulation only on all production-zone supply ductwork.

Mistake 7 — Missing explosion isolation valves at grain handling equipment transitions

The grain handling system from silo to mill to mixer to extruder is a chain of pneumatically connected equipment. Without explosion isolation valves at every transition, a deflagration initiating in one piece of equipment propagates back along the entire chain to the silo and forward to the downstream equipment. The flame front velocity in a duct is typically 50 to 100 metres per second and the explosion isolation valve must close in less than 50 milliseconds. NFPA 660 (2025) specifies the explosion isolation valve requirement and AS 3957 references the equivalent Australian standard.

Mistake 8 — Insufficient capture velocity at the rendering cooker hood

Rendering cooker hood capture velocity below 1.0 metres per second per the ACGIH Industrial Ventilation Manual permits cooker vapour to escape into the rendering plant environment and contaminate the worker breathing zone with H2S, NH3 and amine compounds. The capture velocity test is part of the EPA Air Quality consent verification. Verify capture velocity at commissioning with a calibrated thermal anemometer at the hood face.

Mistake 9 — Pet pharmaceutical cleanroom HEPA bypass

The single most common APVMA audit non-conformance in pet pharmaceutical manufacturing. The supply duct downstream of the terminal HEPA filter must be smooth-bore 316L stainless with no internal lining, no insulation and no dead leg; any internal surface or dead spot becomes a microbial reservoir that bypasses the HEPA filtration upstream. Specify continuous welded longitudinal seam construction and verify at commissioning with airborne particle count to ISO 14644 limits.

Mistake 10 — Galvanised support brackets on stainless duct

Galvanised threaded rod and galvanised brackets in contact with 304L or 316L stainless duct create galvanic cells at the contact line. The galvanised hardware corrodes preferentially and bleeds zinc onto the stainless surface, producing tea-staining that fails the PFIAA member audit and the APVMA inspection. Specify stainless support hardware throughout where stainless duct is installed.

Lead time, FAT and Australian dispatch from Box Hill North VIC

SBKJ's standard lead time for the 304L stainless variant of the SBAL-V auto duct line is 14 to 18 weeks from confirmed deposit to FAT-ready, plus 2 to 4 weeks domestic Australian dispatch from Box Hill North VIC to the customer site. The 316L stainless variant runs 16 to 20 weeks because of the slightly longer lead time on 316L coil supply. The SBTF spiral tubeformer in 304L variant runs 10 to 14 weeks. The SB-ZF1500 stitchwelder for continuous TIG seam construction runs 10 to 14 weeks. The SBSF-1525 round-duct flanger runs 8 to 12 weeks. The SBFB-1500 spiral fitting machine runs 10 to 12 weeks. The SBPC1500 plasma cutter in spark-resistant configuration runs 10 to 14 weeks. The SBLR-600 longitudinal seam welder runs 8 to 12 weeks. Welded longitudinal seam tooling adds 2 to 3 weeks to the SBAL-V lead time. Mill certificate traceability to ASTM A240 or EN 10088-2 and third-party witnessed FAT add 1 to 2 weeks.

Factory Acceptance Test is run at the Box Hill North VIC office before dispatch with the buyer's nominated coil specification and a full production cycle. We do not consider a pet-food-grade machine ready to ship until the FAT report is signed against the contract performance specification. Buyers are welcome to attend the FAT in person or via live video link. The FAT covers tooling alignment, forming pressure on stainless coil, surface finish on the formed duct, seam quality on welded longitudinal seam variants, dimensional accuracy across the full forming envelope, and a full single-shift production run with the buyer's coil. For the spark-resistant SBPC1500 plasma cutter, the FAT additionally covers the spark-resistant tooling configuration and the ground continuity verification.

Australian dispatch from Box Hill North VIC to the customer site is by Australian truck transport with ISPM-15 compliant crating where the machine is shipped via container, with humidity indicators, marine-grade desiccant and full all-risk transit insurance. Installation timing is coordinated with the customer's project programme. SBKJ engineers from the Box Hill North office attend the commissioning on site for 5 to 10 days for installation supervision, mechanical commissioning, electrical commissioning, operator training and Performance Acceptance Test.

How SBKJ supports Australian pet food and animal feed customers

SBKJ Group operates from Box Hill North in Victoria, Australia, with engineering and after-sales support direct to the Australian pet food, animal feed, rendering and pet pharmaceutical sectors. Our typical customer engagement runs through five phases:

• Specification. Engineering review of the facility brief, zone-by-zone duct material and construction class recommendation, machine sizing against the production volume targeted, integration with the AS/NZS 1677 ammonia plant scope, the AS/NZS 60079 hazardous area schedule, the NFPA 660 combustible dust assessment, the NFPA 86 industrial oven schedule, the PFIAA Pet Food Code of Practice CoP and the APVMA Veterinary Medicines registration framework.
• Quotation. Itemised landed-cost worksheet on EXW Box Hill North or delivered-to-site basis, with machine specification, FAT scope, training scope and spare-parts package. For the pet pharmaceutical scope an additional APVMA-aligned validation dossier is included.
• Order and FAT. 30 percent T/T deposit at order confirmation, 70 percent balance against dispatch documentation. FAT run with buyer's 304L or 316L coil before dispatch from Box Hill North.
• Installation and commissioning. 1 to 2 SBKJ engineers from the Box Hill North VIC office on site for 5 to 10 days for installation, mechanical commissioning, electrical commissioning and operator training in English. Coordination with the customer's PFIAA, APVMA or ARA programme owner.
• After-sales. 12-month warranty from commissioning, one-year wear-parts kit shipped with the machine, 72-hour remote support response from Box Hill North, 10-year-plus parts continuity guarantee.

Talk to an SBKJ engineer about your pet food facility brief, your dry kibble extrusion line expansion, your wet pet food retort canning line refit, your bird feed or livestock feed pellet mill upgrade, your rendering plant odour control train rebuild, or your APVMA-registered pet pharmaceutical cleanroom — we typically respond within 12 hours during Australian business hours. Contact SBKJ for an itemised landed-cost quote, or browse the full machines catalogue and the SBKJ Insights library for related guides.

SBKJ at ARBS 2026 — Sydney May 2026

SBKJ Group attends ARBS 2026 in Sydney in May 2026 as the principal Australian HVAC industry exhibition. The Mars Petcare procurement and engineering team, the Real Pet Food Co Ingleburn engineering team, the Nestlé Purina Blayney engineering team, the Hill's Pet Nutrition Australia team, the Ridley Corporation engineering team and the Vetafarm engineering team are all expected to attend. Book a meeting at the SBKJ stand to discuss your facility brief, walk through the SBAL-V demonstration unit at the stand and ask the SBKJ engineering team about your specific zone-by-zone duct material schedule.

The five highest-leverage decisions on a pet food HVAC project

Across hundreds of Australian and export-market pet food, animal feed and rendering plant duct projects, the pattern we see is that the engineering scope is well understood — AS 5812, AS/NZS 60079, NFPA 660, NFPA 86, AS/NZS 1677, the PFIAA Pet Food Code of Practice CoP and the APVMA Veterinary Medicines registration framework are all documented — but integration is where projects succeed or fail. The five highest-leverage decisions:

1. Get the duct material schedule right at the start. Drawing the boundary between heavy-gauge galvanised grain handling scope, 304L stainless extruder hall and treats line scope, 316L stainless wet retort hall and rendering scope, 309/310S high-temperature RTO scope, FRP wet-scrubber inlet scope and APVMA cleanroom scope is the largest single capital decision in the duct package. Get it right at design stage, not after the PFIAA auditor or APVMA inspector flags it. The capex differential between an over-specified stainless-throughout solution and a properly zoned mixed-material schedule can be 20 to 30 percent on the duct fabric cost line.
2. Document the AS/NZS 60079 and NFPA 660 hazardous area schedule thoroughly. Grain and feed dust deflagration is the single highest acute hazard in any pet food or feed mill. The Zone 21/22 classification, the deflagration vent panel sizing, the explosion isolation valve specification, the electrical bonding and grounding schedule, and the intrinsically safe instrumentation list are all critical. Late changes to the hazardous area schedule ripple through every HVAC and electrical package on the project. The hazardous area schedule should be the first deliverable.
3. Size the rendering plant odour control train for the worst-case load with safety margin. State EPA Air Quality consent failures on rendering plant operation are slow, expensive and reputationally damaging. The wet scrubber sized at 25 percent safety margin to peak cooker load, the RTO sized for 800 to 900 degrees Celsius continuous operation with 90 to 95 percent thermal recovery, the biofilter sized for 30 to 45 second empty-bed contact time, the discharge stack sized for 1.5 metres per second minimum exit velocity and 3 metres minimum above adjacent occupied buildings — these are the foundational parameters. The ARA Australian Renderers Association guidance covers the methodology and should be the foundational reference.
4. Specify FAT at the Box Hill North VIC office on every machine and every duct package. Compromised FAT correlates strongly with post-installation disputes. The cost of a thorough FAT is one week. The cost of skipping it is a rework cycle measured in months. SBKJ runs FAT at the Box Hill North VIC office on every machine with the buyer's nominated coil. The duct fabricator should run an equivalent acceptance test on the fabricated duct against the project specification before shipment to site. For the spark-resistant SBPC1500 plasma cutter the FAT additionally covers the spark-resistant configuration verification.
5. Plan the APVMA validation dossier from the start for pet pharmaceutical projects. The APVMA Veterinary Medicines registration framework requires a comprehensive validation dossier covering IQ Installation Qualification, OQ Operational Qualification and PQ Performance Qualification for the cleanroom HVAC envelope. The dossier requirements are aligned with TGA GMP and ISO 14644 cleanroom standard. Build the validation dossier programme into the project from design stage; retro-fitting validation documentation after build-out costs 3 to 5 times the design-stage cost.

Get an itemised SBKJ quote for your pet food, dry kibble extruder, wet pet food retort, treats, bird feed, livestock feed, rendering or pet pharmaceutical project →

FAQ

What hazardous area classification applies to grain handling and feed dust?

Grain, cereal and feed dust have Kst values 100 to 160 bar metres per second — St 1 explosion class. Under AS/NZS 60079.10.2 the silo, pneumatic conveyor and bucket elevator interior is Zone 21; the exterior space around hammermill, pellet mill, dust collector, baghouse and cyclone is Zone 22. Engineered to NFPA 660 (2025), NFPA 68 deflagration venting, NFPA 69 explosion protection and AS 3957. SBKJ supplies the dust extraction ductwork in heavy-gauge galvanised or carbon steel with bolted flanged connections, electrically continuous, with explosion isolation valves and deflagration vent panels.

How is the dry kibble extruder envelope engineered?

200 to 500 kg/hr throughput Wenger or Buhler twin-screw extruder. Pre-conditioner 90 to 100°C, extruder barrel 80 to 150°C, dryer 60 to 90°C counterflow, cooler at ambient, vacuum coater 60 to 80°C. NFPA 86 industrial oven Class B with combustion safety, purge cycle, overtemperature shutdown. Supply HEPA MERV 13, dryer extract heavy-gauge 304L stainless welded seam, cooler exhaust Zone 22 dust hazardous area. Mars Petcare Wodonga, Real Pet Food Co Ingleburn, Nestlé Purina Blayney all run this envelope.

How is wet pet food retort canning sterilisation HVAC engineered?

Retort 121°C 30-60 min saturated steam 1-1.5 bar gauge, F0 3 commercial sterility. Container 3-piece tin can, 2-piece aluminium can, pouch, aseptic pouch. 316L stainless throughout because of saturated steam, chlorine CIP and chloride from cooling water. Steam vent welded seam 30° slope, can warmer 80°C hood, post-retort cooler 30 to 40°C, seam-checker extract 0.5 m/s capture. CO 30 ppm STEL, CO2 5000 ppm 8-hr TWA monitored.

What is the H2S and NH3 exposure standard in a pet food rendering plant?

H2S 10 ppm 8-hr TWA, 15 ppm 15-min STEL; lethal at 200 to 300 ppm with olfactory paralysis above 100 ppm. NH3 25 ppm 8-hr TWA, 35 ppm 15-min STEL. Three-stage train: wet scrubber NaOCl or NaOH 25 percent safety margin to peak cooker load, RTO 800 to 900°C three-vessel switching 90 to 95 percent recovery, biofilter polish 30 to 45 second contact. H2S and NH3 monitoring at every stage with alarm 5 ppm H2S 15 ppm NH3. Discharge stack 1.5 m/s minimum 3 m above adjacent roof. SBKJ 316L stainless and 309/310S high-temperature.

What ammonia refrigeration standards apply to pet food cold storage and IQF?

R-717 ammonia under AS/NZS 1677 Parts 1 to 4 and AS/NZS 5149. IQF freezer minus 25 to minus 35°C direct expansion or pumped. Compressor room Class I Zone 2 under AS/NZS 60079.10.1, emergency exhaust 30 ACH minimum. Ammonia 25 ppm 8-hr TWA, alarm 15 ppm shutdown 25 ppm, spark-resistant motor and damper actuator throughout. Mars Petcare Wodonga, Real Pet Food Co Ingleburn, Nestlé Purina Blayney, Hill's all run R-717. 316L stainless duct in any wet ammonia space — galvanised fails inside months.

What is AS 5812 and how does it govern pet food HVAC?

AS 5812 Manufacturing and Marketing of Pet Food is the Australian Standard for safe, hygienic, nutritionally appropriate pet food. Referenced in the PFIAA Pet Food Code of Practice CoP. Requires HACCP aligned with ISO 22000, traceability, microbiological limits, physical contamination controls (metal detector, X-ray). Duct above any open ingredient or product surface is audit-visible and must support daily sanitation. 316L stainless welded seam in wet pet food canning, 304L stainless or heavy-gauge galvanised in dry kibble extrusion, dedicated extract on every dust-generating point. PFIAA members include Mars Petcare, Real Pet Food Co, Nestlé Purina, Hill's. APVMA regulates pet pharmaceutical and medicated pet food.

What HVAC specification does Vetafarm Wagga Wagga bird feed manufacturing require?

Combines Zone 22 grain and seed dust hazardous area (NFPA 660, AS/NZS 60079.10.2) with AQIS biosecurity for Newcastle disease and HPAI. Seed mix processing respirable dust 5 mg/m³ WES, inhalable 10 mg/m³. Hammermill, pellet mill, extrusion line Zone 22 with full dust extraction. Hand-rearing formula line HEPA-filtered supply, dedicated extract, AQIS biosecurity between native and exotic bird species product. APVMA registration for veterinary product (BeneFlex joint health, Vetfood supplement, avian probiotic). Heavy-gauge galvanised dust extraction, 304L stainless pellet press zone, HEPA supply hand-rearing room.

How is the Ridley Corporation livestock feed pellet mill HVAC engineered?

ASX:RIC, largest integrated livestock feed manufacturer in Australia — dairy, poultry, pig, sheep, ruminant, horse, aquaculture. Pellet mill Zone 22 dust hazardous area under AS/NZS 60079.10.2 with NFPA 660 throughout. Kst 100 to 160 bar metres per second; NFPA 68 deflagration vent panels on dust collector, baghouse, cyclone. APVMA-registered medicated premix at the mixer station with tighter operator exposure control. Heavy-gauge galvanised throughout the dust extraction, bolted flanged connections, electrically bonded and grounded at every flange, explosion isolation valves at every equipment transition. Coprice Riverina, Riverina Stockfeeds, Wagga Stockfeeds, Lienert Australia equivalent envelopes.

What pet pharmaceutical APVMA GMP HVAC specification applies?

APVMA regulates pet pharma, vet medicine, vaccine, medicated pet food. TGA GMP principles equivalent to human pharma. ISO 14644 cleanroom typically ISO 8 solid dose, ISO 5 aseptic. ASHRAE 170 ventilation for healthcare. Virbac Milperra (Drontal, Bravecto, Frontline, NexGard, Heartgard, Advocate), Vetafarm Wagga (BeneFlex, Vetfood, avian product). Cleanroom HVAC 316L stainless welded seam throughout, smooth-bore, HEPA H13 or H14 supply, positive pressurisation cascade ISO 5 +25 Pa to ISO 7 +15 Pa to ISO 8 +5 Pa. SBKJ supplies cleanroom duct via SBAL-V 316L with SB-ZF1500 stitchwelder.

What is the lead time for an SBKJ pet-food-spec SBAL-V in 304L and 316L stainless?

SBAL-V 304L stainless variant 14 to 18 weeks deposit to FAT-ready, plus 2 to 4 weeks Australian dispatch from Box Hill North VIC. SBAL-V 316L stainless 16 to 20 weeks. SBTF spiral 10 to 14 weeks. SBFB-1500 spiral fitting machine 10 to 12 weeks. SB-ZF1500 stitchwelder 10 to 14 weeks. SBSF-1525 round flanger 8 to 12 weeks. SBPC1500 plasma cutter spark-resistant 10 to 14 weeks. SBLR-600 longitudinal seam welder 8 to 12 weeks. Welded seam tooling adds 2 to 3 weeks. SBKJ books slots six months ahead for Mars Petcare, Real Pet Food Co, Nestlé Purina, Hill's, Vetafarm and Ridley Corporation specifications.