Product catalog
Duct Machinery
Spiral tubeformers, auto duct lines, flange forming and auxiliary machines. Each product has its own page with image, video, intro and technical data.
Every machine is built at the Jiangyin factory under an ISO 9001:2015 quality control system, HD demo footage is available on request through the video library, and real installation outcomes are documented in the case studies library. If you’re short-listing SBKJ against other HVAC duct machinery vendors, the why choose SBKJ page sets out the ten reasons buyers pick SBKJ plus the three scenarios where SBKJ isn’t the right fit. For transparent 2026 budget ranges, lead times and payment terms on every SBKJ machine family before you request a quote, see the pricing and lead time buyer guide. Not sure which configuration suits your project? The HVAC duct machinery by industry guide maps machine selection to the end-use vertical — with dedicated pages for data centers, cleanrooms and hospitals.
Get a quotation in 12 hoursExplore by category
Six application-based categories — each with buyer's guide, specs comparison and FAQ.
Auto Duct Production Lines
SBAL-V / III / II · 800–2,500 m²/day
Spiral Duct Machinery
SBTF tubeformers · Φ80–Φ2000 mm + round duct
TDF & Lockformer
TDF flange, Pittsburgh lock, duct zipper
Cutting & Forming
Plasma, laser, shears, folders, bending
Flexible Duct Machinery
SBLR aluminum flex · canvas · insulated
Duct Welding Machines
Stitch · seam · spot · laser · angle-iron
Featured Machines
Flagship equipment with full specs on each product page.
Auto Duct Line SBAL‑V
U‑shape automatic line · 800–2500 m²/day
Auto Duct Line SBAL‑III
Hydraulic notching & shearing · ~1000 m²/shift
Spiral Tubeformer SBTF‑1602
Φ80–Φ1600 mm · Flying shear
Spiral Tubeformer SBTF‑1500
Φ80–Φ1500 mm · Saw blade cutting
Gorelocker SBEM‑1250
Hydraulic elbow machine · 100–1250 mm
Transverse Duct Flange
TDF flange forming · SBTDF‑12 / 1.5‑16
Lockformer (SBLC Series)
Pittsburgh lock & cleat forming
Seam Closing SBHF‑I
Duct zipper · 15 m/min
All Products by Category
Click any machine to view its detail page with image, video, intro and parameters.
Spiral Tubeformers
Round Duct Equipment
Flexible Duct Machines
Auto Duct Lines
Flange & Forming
- Transverse Duct Flange Forming Machine
- Transverse Duct Flange Cleat Cutting Machine
- Transverse Duct Connector Flange Forming Machine
- Lockformer (SBLC Series)
- Seam Closing Machine SBHF‑I (Duct Zipper)
- Duct Zipper (TDF) SBHF‑1.5×1500TDF
- Transverse Duct Flange Hand Folder
- Grooving Machine
- Power Slitting & Beading Machine SBLQ‑15
- Round Flange Forming Machine SBYFL‑50
- Round Flange Punching Machine SBYFL‑50‑1
- Auto Corner Making Machine
- Cleat Cutting Machine SBKT‑12
Cutting Machines
Welding Machines
Bending, Rolling & Folding
Contact us for photos and detailed specifications.
Buyer's guide
How to Choose HVAC Duct Machinery
Use this short framework to narrow the SBKJ catalogue down to the right machine for your project. If you would prefer a direct recommendation, send us your duct drawings and target throughput — an SBKJ engineer will reply with a shortlist within 12 hours.
1. Match duct geometry first
Round, rectangular and oval duct each demand a different forming process. Round spiral duct is produced on flying‑shear tubeformers (SBTF series). Rectangular duct is built on auto duct lines (SBAL, RDL) or pittsburgh lockformers. Oval duct is rolled on dedicated ovalizers from a circular blank.
- Round ≤ 1500 mm → SBTF spiral tubeformer
- Rectangular up to 2000 mm → SBAL auto duct line
- Oval up to 1500 × 800 mm → SBHT ovalizer
2. Size to your daily throughput
Daily output is the most common reason customers under‑ or over‑specify a line. SBAL‑V handles up to 1,200 m²/day of TDF rectangular duct, RDL‑II up to 800 m²/day, and a single SBTF‑1500 spiral line up to 600 m of round duct per shift.
- < 300 m²/day → SBAL‑III semi‑auto
- 300–800 m²/day → SBAL‑V or RDL‑II
- > 800 m²/day → multi‑line SBAL‑V cell
3. Pick the standard you must comply with
SMACNA, EN 1505/1506, AS/NZS 4254 and DW/144 each demand different reinforcement, tolerance and seam types. Tell us the standard on your enquiry — we configure the line tooling and PLC recipes accordingly so first‑article duct passes inspection.
- SMACNA → Pittsburgh + TDF + cross‑break
- EN 1505 → Slide‑on flange + class‑B leakage
- AS/NZS 4254 → S‑cleat or TDF + bracing
4. Decide automation level last
Automation level is the easiest variable to change. Most workshops start with a semi‑automatic line and upgrade to fully automatic plasma cutting and pittsburgh seaming once the order book justifies it. SBKJ designs every line with that upgrade path in mind so you can scale incrementally without replacing the whole platform.
- Manual entry: lockformer + plate shears
- Semi‑auto: SBAL‑III + plasma cutter
- Fully auto: SBAL‑V or RDL‑II turnkey cell
Capability comparison
Auto Duct Production Lines at a Glance
Quick side‑by‑side reference for the four flagship rectangular and round duct platforms. Detailed specifications and demo videos live on each product page.
| Model | Duct type | Material | Width range | Daily output | Best for |
|---|---|---|---|---|---|
| SBAL‑V | Rectangular TDF | 0.5–1.5 mm GI / SS | Up to 1500 mm | Up to 1200 m² | High‑volume commercial & airport projects |
| SBAL‑III | Rectangular TDF | 0.5–1.2 mm GI | Up to 1300 mm | Up to 600 m² | Mid‑sized fabricators upgrading from manual |
| RDL‑II | Rectangular TDF + S‑cleat | 0.5–1.2 mm GI | Up to 1500 mm | Up to 800 m² | Mixed TDF and S‑cleat output workflows |
| SBTF‑1500 | Round spiral | 0.4–1.2 mm GI / SS / Al | Ø80–1500 mm | Up to 600 m | Spiral round duct for HVAC and dust collection |
Industries served
Where SBKJ Duct Machinery is Working Today
Different end‑markets demand different duct standards, materials and reinforcement. SBKJ machines are commissioned for all of them.
Commercial & high‑rise HVAC
Office towers, hotels, malls and mixed‑use developments. Typically TDF rectangular duct in 0.6–1.0 mm galvanised steel built on SBAL‑V or SBAL‑III lines, with spiral round runs for retail concourses.
Airports, metros & rail
Terminal HVAC, jet‑bridge ventilation, metro tunnel ventilation and station pressurisation. Heavy‑gauge SMACNA duct on multi‑line SBAL‑V cells plus large‑diameter SBTF‑1500 and SBTF‑2020 spiral lines.
Data centres & cleanrooms
Hyperscale data centres, semiconductor fabs, pharma cleanrooms and hospitals. Stainless steel and aluminium spiral duct from SBTF lines, plus low‑leakage rectangular duct from SBAL‑V with class‑C seams.
Industrial & food processing
Factories, warehouses, food & beverage and chemical plants. Heavier 1.0–1.5 mm GI or SS304 duct, often with gas‑tight welded seams from SBKJ stitch welders and seam welders.
Tunnel & mining ventilation
Road tunnels, mines and underground utilities. Large‑diameter spiral duct from SBTF‑1500 / 2020 plus flexible duct from SBLR‑600 lines for short‑run tunnel face ventilation.
Marine & offshore
Ship HVAC, offshore platforms and FPSO vessels. Stainless and galvanised duct on SBAL lines with corrosion‑resistant fittings, often integrated with SBKJ welding cells for marine‑grade seams.
Common questions
Buyers Frequently Ask
Short answers to the questions our engineers hear most often during a first quotation. For a deeper technical discussion, send us your project specification.
Which auto duct line should I start with?
If your daily rectangular duct demand is below about 400 m² and you are upgrading from manual fabrication, the SBAL‑III is the most common starting point. It includes plasma cutting, pittsburgh seaming and TDF flanging on a single platform but at a lower capital cost than SBAL‑V. Above 600 m²/day or when you need very short job changeover, step up to SBAL‑V.
Can I produce both round and rectangular duct on one line?
No — round (spiral) and rectangular duct use fundamentally different forming processes and tooling. Most SBKJ customers run a spiral tubeformer (SBTF series) alongside an auto duct line (SBAL series) so they can quote either geometry without subcontracting. The two machines share material storage and shipping flow, so the workshop layout stays compact.
Do the machines support SMACNA, EN 1505 and AS/NZS 4254?
Yes. Tell us the standard on your enquiry and SBKJ will configure the tooling, PLC recipes and seam types to match. SMACNA projects typically use Pittsburgh + TDF + cross‑break, EN 1505 uses slide‑on flange with class‑B leakage limits, and AS/NZS 4254 uses S‑cleat or TDF with reinforcement bracing. All three are routine for SBKJ.
What material thickness can the SBKJ lines handle?
Most rectangular duct lines run 0.5–1.5 mm galvanised or stainless steel. Spiral tubeformers handle 0.4–1.2 mm depending on diameter. For 1.5 mm and above, we often add an additional pre‑bender or use the SBTF‑2020 heavy‑duty platform. Always send the actual material grade and gauge so the engineer can confirm.
How long does delivery and commissioning take?
Standard SBAL and SBTF machines ship from Jiangyin in 60–90 days. Commissioning on customer site usually takes 5–10 working days for a single line, including operator training and first‑article duct production against your project standard. SBKJ field engineers travel to all 80+ countries we serve.
What warranty and after‑sales support is included?
Every SBKJ machine ships with a 12‑month standard warranty on mechanical and electrical components. After‑sales support includes remote troubleshooting within 72 hours, original spare parts and consumables, and preventive maintenance recommendations from the engineer who commissioned your line.
Need technical data or a quotation?
Each product page has full specifications. For custom configurations, contact us.
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