HVAC systems demand materials that deliver exceptional corrosion resistance, precise formability, and long-lasting structural integrity. We manufacture and supply premium galvanized steel coils and sheets engineered specifically for ductwork and climate control infrastructure.
Technical Specifications:
Etando ya bonene: 0.4mm – 2.0mm
Standard Width: 600mm – 1250mm (Custom slitting and cut-to-length services available)
Forming Grades: DX51D+Z / SGCC+Z (Ideal for standard ductwork and lock-forming)
Structural Grades: S220GD+Z, S250GD+Z, S280GD+Z (Engineered for high-strength requirements)
| Makambo ya sikisiki | Details for HVAC Ebende ya galvanisé |
| Biténi ya biloko | DX51D+Z, SGCC+Z, S220GD+Z to S280GD+Z (Commercial & Structural) |
| Bonene | 0.4mm – 2.0mm |
| Bonene ya momeseno | 1000mm, 1219mm (4ft), 1250mm (Custom slitting services available) |
| Bopakoli ya zinc | Z60 – Z275 g/m² (ASTM G20 – G90 equivalents available) |
| Bongisi ya likolo | Zero Spangle (F), Minimized Spangle (M), Regular Spangle (N) |
| Coil ID | 508mm (20″) / 610mm (24″) |
| Bozito ya nsinga | 3 MT – 8 MT (Customizable based on container loading limits) |
| Motango ya nse oyo esengeli koteka | Tonne métrique zomi na mwambe |
| Liboke ya kotinda na bapaya | Premium seaworthy packing: plastic film, waterproof paper, galvanized steel envelope, metal banding, and edge protection. |
With its superior processing and forming properties and durable corrosion resistance, our galvanized steel coils play a crucial role in the HVAC and equipment manufacturing industry, fully meeting a wide range of stringent engineering standards:
HVAC and Ventilation Duct Systems: As the industry’s preferred material for manufacturing ventilation duct networks, galvanized steel coils offer excellent bending and interlocking properties. Whether it’s supply air ducts, return air ducts, smoke exhaust systems, or complex fittings such as elbows, tees, and reducers, they ensure the airtightness and long-term efficient operation of duct systems.
High-Strength Structural Support Components: For support structures requiring high rigidity and corrosion resistance (such as duct hangers, mounting brackets, fixing clamps, and heavy-duty air conditioning unit bases), the galvanized coating provides a robust physical barrier, offering a safe and high-load-bearing structural foundation in humid or challenging working environments.
Unit Housings and Equipment Protection: Perfectly balancing structural strength and corrosion resistance, it is the ideal choice for manufacturing housings for combined air conditioning units, fresh air handling units, fan boxes, and fan coil units. It not only effectively protects the internal core components, but also significantly extends the overall commercial lifespan of the equipment.
| Application Area | Typical Components | Recommended Steel Grade | Suggested Zinc Coating Weight (Double-sided) |
| HVAC Ducts & Fittings | Rectangular/spiral ducts, elbows, tees, reducers | DX51D+Z / SGCC |
Indoor (Dry): ≥ Z80
Indoor (Humid): ≥ Z120
Outdoor (Mild): ≥ Z180
High Humidity/Coastal: Z275 or Aluzinc (GL) |
| Structural Supports & Hangers | Duct hangers, fixing brackets, equipment bases | S220GD+Z / S250GD+Z |
Indoor: ≥ Z80
Outdoor/Damp: ≥ Z120 |
| AC Unit & Equipment Housings | Fan coil units, air handling unit (AHU) covers | DX51D+Z / SGCC |
Indoor (Dry): ≥ Z80
Indoor (Humid): ≥ Z120
Outdoor: ≥ Z180 |
| Condensate Drainage Systems | Drain pans, condensate collection troughs | DX51D+Z / SGCC |
Indoor (Humid): ≥ Z120
Outdoor/High Moisture: ≥ Z180 |
| Fire & Smoke Exhaust Systems | Fire dampers, smoke exhaust duct housings | DX51D+Z / SGCC |
Standard Indoor: ≥ Z80
Outdoor/Damp: ≥ Z120 |
“When it comes to HVAC installations, material reliability is non-negotiable. As a dedicated manufacturer with a proven track record of supplying global markets, Bomis Steel specializes in premium galvanized steel coils engineered specifically for ductwork and climate control systems.
Manufactured to rigorous international standards (including ASTM A653 and EN 10346), our coils deliver the exact formability and zinc coating precision your projects demand. Partner with us to secure top-tier materials that keep your HVAC projects on schedule and built to last. Contact our team today to discuss your exact specifications.”
Q1: What zinc coating weight is recommended for HVAC ductwork?
A: The ideal zinc coating depends entirely on your project’s environment. For standard indoor ventilation systems, a coating of Z80 to Z120 (80g-120g/m²) is typically sufficient. However, for outdoor ducts, high-humidity environments, or coastal areas, we strongly recommend G90 (Z275) or higher to ensure ultimate corrosion resistance. We can customize the coating weight to meet your exact engineering specifications.
Q2: What steel grades do you supply for HVAC applications?
A: To meet the diverse manufacturing needs of ductwork and equipment, we primarily supply commercial-quality grades with excellent cold-forming properties, such as DX51D+Z, SGCC, and CS Type B. For structural supports and heavy-duty equipment bases, we also offer high-strength structural grades like S220GD+Z to S350GD+Z, ensuring maximum physical stability for your HVAC systems.
Q3: Will the zinc coating flake off during lock-forming or spiral duct manufacturing?
A: Absolutely not. We strictly control the annealing and galvanizing processes to ensure superior coating adhesion. Our galvanized steel coils feature “lock-forming quality” (LFQ), meaning they are specifically engineered for deep processing like bending, stamping, and lock-seaming. The zinc layer will not peel or flake, even when manufacturing complex spiral ducts, elbows, or tees.
Q4: Regular Spangle vs. Zero Spangle: Which is better for air ducts?
A: In terms of anti-corrosion performance, there is no fundamental difference between the two; it is primarily an aesthetic and surface finish choice. Regular spangle has the traditional crystallized texture and is widely used for concealed ductwork. Zero (or minimized) spangle offers a smoother, more uniform surface. We recommend zero spangle for exposed ductwork (like in commercial gyms or malls) or if the equipment housing requires post-painting.
