HVAC Duct Machinery FAQ

SBKJ Group manufactures HVAC ductwork machinery: spiral duct forming machines (Φ80 to Φ2000 mm), automatic rectangular duct production lines (SBAL-V and SBAL-III), TDF flange forming machines, Pittsburgh lockformers, gore-lockers, elbow welders, seam closing machines and auxiliary equipment. Founded 1995 in Jiangyin, China.

Over 5,000 SBKJ machines are installed in more than 80 countries across six continents, including Australia, Saudi Arabia, UAE, Singapore, Indonesia, Malaysia, Vietnam, UK, Germany, France, Russia, Brazil, Mexico and many others.

Yes. SBKJ Group is ISO 9001:2015 certified. All machines are CE marked for European compliance. SBKJ holds 60+ invention and utility patents in its own name.

No.78 Huanxi Road, Zhutang Town, Jiangyin City, Jiangsu Province, China. The Australia office is at 5 Twyford Street, Box Hill North, VIC 3129, Australia.

An SBAL-V fully automatic auto duct production line produces 800 to 2,500 square meters of finished rectangular duct per day with a single operator. Output depends on duct size mix, material and shift pattern.

SBAL-V is fully automatic, single-operator, U-shape flow with integrated TDF and Pittsburgh lock. SBAL-III is hydraulic semi-automatic with separate TDF and lockformer stations and typically two operators. SBAL-V has roughly 3x the productivity per operator hour. See our side-by-side comparison.

Galvanized steel (G60, G90, G115), stainless steel 304 and 316, aluminium (3003-H14 and 5052-H32) and aluminised steel. Thickness range 0.5 to 1.5 mm on auto duct lines; heavier gauge on standalone equipment. See our material selection guide.

Approximately 30 meters by 8 meters of clear floor area, with 1.5 m clearance on both long sides. Ceiling height minimum 4.5 meters. See our factory layout guide.

From Φ80 mm up to Φ2000 mm. The SBTF-1602 covers Φ80 to Φ1600 mm with flying shear cutting. The SBTF-2020 extends up to Φ2000 mm for large industrial duct.

Flying shear cuts the spiral duct while it is still moving through the line — no sparks, no swarf, no secondary deburring — and is preferred for high-volume production. Saw blade stops the duct briefly and cuts with a rotating blade; mechanically simpler and easier to maintain. See our spiral forming guide.

TDF stands for Transverse Duct Flange. It is a metal flange profile rolled directly into the end of a rectangular duct section, eliminating the need for bolted angle frames. TDF joints install 3 to 5 times faster than angle flange and achieve better seal class. See our TDF vs angle flange comparison.

The Pittsburgh lock is the standard longitudinal seam for rectangular HVAC duct. It interlocks two sheet metal edges into a 5-bend profile, then flattens them into a single continuous seam. Formed on a lockformer (SBLC series) and closed on the duct line.

SMACNA Seal Class A is the tightest duct seal class, requiring all transverse joints, longitudinal seams and duct wall penetrations to be sealed. Used for high-pressure systems (3 in. w.g. and above) and critical applications like laboratories, hospitals and clean rooms. For project-specific machine guidance see the HVAC duct machinery by industry hub and the data center vertical. Also see our SMACNA seal classes guide.

Production lead time at the Jiangyin factory is 60-90 days depending on configuration. Add 30-45 days for sea freight to most destinations, plus 5-14 days customs clearance. Total door-to-door is typically 4-5 months from contract signing. See our full importing guide.

SBKJ supports EXW, FOB Shanghai, CIF, CFR and DDP. CIF is the most common for first-time buyers because SBKJ handles export customs and main carriage. DDP can be quoted on request for buyers who want a single landed cost to their warehouse.

30% deposit by T/T to confirm the order, 70% balance against bill of lading copy or before shipment. Letter of credit (L/C) at sight is also accepted for orders above USD 100,000.

Yes. SBKJ provides commercial invoice, packing list, bill of lading, certificate of origin (Form A or generic), CE certificate and HS code declaration as part of the standard export pack.

Most HVAC duct forming machines use HS code 8462.49 or 8479.89. SBKJ provides the correct HS code on the commercial invoice for customs clearance.

Yes. SBKJ welcomes factory visits at the Jiangyin headquarters, including a Factory Acceptance Test (FAT) before shipment. SBKJ also runs an Australia office in Box Hill North, VIC for English-speaking buyers.

Yes. Every auto duct line and major machine goes through a Factory Acceptance Test at the Jiangyin factory before shipment. FAT includes full forming cycle on customer coil specs, tolerance measurement, TDF and Pittsburgh seam verification, and a signed PLC cycle log.

12 months standard warranty on all machines from the date of commissioning. Preventive maintenance recommendations are provided, and original spare parts are available from the Jiangyin factory for the life of the machine.

Yes. On-site installation supervision by SBKJ engineers is included with every auto duct line, typically 1-2 engineers for 5-10 days. Covers mechanical commissioning, electrical hookup, PLC calibration and first production run.

Yes. Hands-on operator and maintenance training is delivered at the customer's factory or at SBKJ's Jiangyin headquarters. Covers PLC operation, tooling changeover, preventive maintenance and troubleshooting.

SBKJ commits to a technical support response within 72 hours via WhatsApp or video call. Most issues are diagnosed remotely; on-site visits are scheduled for complex mechanical work.

SBKJ machines are designed for a 15 to 20 year service life under normal use with proper preventive maintenance. Many 1990s and 2000s SBKJ machines remain in daily production worldwide. Original spare parts remain available for all machines SBKJ has manufactured.

Standard: 380 V, 3-phase, 50 Hz. 60 Hz versions are available on request for North America, parts of South America and Japan. Installed power ranges from 5 kW for small machines to 40+ kW for a full SBAL-V auto duct line.

English and Mandarin Chinese are the primary support languages. The Australia office (Box Hill North, VIC) handles English-language enquiries. Technical drawings and manuals are provided in English.

Yes. SBKJ offers OEM and private-label manufacturing for distributors and system integrators with sufficient volume. Machine branding, color schemes and documentation can be customised. Contact sales@sbkjduct.com for OEM pricing.

Yes. SBKJ supplies complete turnkey HVAC duct factory packages including coil storage, spiral tubeformers, auto duct lines, TDF flange, lockformers, plasma/laser cutting, elbow welders and layout drawings. Single-vendor responsibility across the entire line.

Email sales@sbkjduct.com or WhatsApp +61 435 074 994. Share duct size range, daily output target, material and thickness, country of installation. SBKJ replies within 12 hours with a machine configuration and budget.