HVAC Ductwork Galvanized Steel Coil Z120 Zinc Coating 0.5-1.2mm Thickness Slit Edge

Ventilation duct is a high volume, low margin product, so the coil must run fast, form cleanly and hold a tight lock seam without splitting. This HVAC ductwork galvanized steel coil is specified with a Z120 zinc coating on a draw quality base, thickness 0.5 mm to 1.2 mm and slit edge trimmed to the exact width your spiral or rectangular line requires, from 600 mm up to 1250 mm. The combination of moderate coating weight and controlled surface friction lets the coil travel through lock formers, Pittsburgh seamers and spiral winders at production speed without zinc pickup on the forming rolls. We also control coil weight to a narrow band, because a duct line loses more time to coil changes than to any other single cause during a shift.

• Z120 Balanced Coating: Enough zinc for indoor and semi exposed duct service without the flaking risk that heavy coatings can show on tight lock seams
• Lock Forming Surface: Controlled friction and oil film so that Pittsburgh seams and button locks close cleanly at line speed
• Slit Edge Precision: Width tolerance within plus or minus 0.5 mm and burr below 0.05 mm for airtight spiral duct seams
• Draw Quality Base: Elongation above 20 percent supports roll forming and bending of square elbows and transitions without cracking
• Consistent Coil Weight: 3 to 6 MT coils matched to your accumulator capacity, reducing changeover downtime on high output lines
• Clean Interior Face: Surface free of zinc dust and roll marks so that duct interiors meet hygiene requirements in food and hospital projects

Duct coil of this specification goes into rectangular and spiral ductwork for commercial buildings, hospitals, clean rooms, shopping malls, metro stations and industrial ventilation, as well as air handling unit casings, plenum boxes, fire dampers and kitchen extract canopies. In humid climates it is often paired with internal insulation, so the coil face must be clean enough for adhesive bonding. Fabricators running spiral machines appreciate the consistent width and low burr, while contractors value the Z120 coating because it resists condensation related staining during construction, when ductwork frequently sits unprotected on site for weeks before the system is commissioned.

Each coil is wrapped in VCI anti-corrosion film, covered by a layer of waterproof kraft paper and a galvanized steel outer skin, then secured with three circumferential and two longitudinal steel straps on a fumigation-free plywood pallet. Eye-to-sky or eye-to-wall orientation is confirmed against the buyer's unloading equipment, and a desiccant pack is added for long sea voyages. Coils are loaded into 20ft or 40ft containers with timber dunnage and air bags to prevent shifting. Every shipment is accompanied by a mill test certificate to EN 10204 3.1, a packing list and a coating weight report, and third-party inspection by SGS or BV can be arranged before loading.

We supply duct coil to HVAC fabricators and mechanical contractors in the Middle East, Southeast Asia, Africa and South America, many of whom run spiral lines around the clock. Because duct production is priced to the last cent, our offer includes width optimisation: we will review your cut list and propose a slitting pattern that reduces trim loss across a container. Coils are supplied with a coating weight report and mechanical test certificate, and we can hold a rolling stock programme for regular buyers so that lead time stays inside two weeks. Our technical staff will also advise on the coating class appropriate to the project specification, since over specifying zinc adds cost without benefit in conditioned indoor ductwork.Our team has supported duct fabricators since 2008 and understands the difference between a coil that passes a specification and a coil that runs well on a spiral line at 60 metres per minute. We hold ISO 9001:2015 certification, test coating adhesion by bend and impact after every production run, and can arrange pre shipment inspection by SGS or BV. If a coil fails to form as expected, we investigate with your line data and, where the fault is ours, replace the material rather than argue about tolerances.