Custom HVAC Sheet Metal Components for Equipment Manufacturers & OEMs
We fabricate the sheet metal your HVAC equipment is built from — AHU panels, frames, fan housings, access doors, filter frames and condensate drain pans — to your drawings, from a single prototype to production runs. One supplier for the enclosures and structural sheet metal inside air-handling and refrigeration equipment.
At a Glance
HVAC equipment OEMs rarely need a ductwork contractor — they need a sheet metal supplier that understands equipment chassis: panels that fit the cabinet, brackets that hold the coil, a drain pan that does not leak, a fan shroud that lines up. We make those discrete components to your drawings and referenced standards, in the materials and finishes your unit calls for, from a single prototype to production runs. We are a component manufacturer, not a field-duct installer.
HVAC Sheet Metal Components We Make
We produce the fabricated sheet metal pieces that go inside and around HVAC equipment — not spiral duct runs or building duct systems. The families below are the ones HVAC OEMs most often source from us; each is built to your drawing, cutout schedule and bill of materials.
AHU Panels & Enclosures
Cabinet side panels, base trays and access-ready enclosures for air-handling units, built to your panel layout and cutout schedule.
Frames & Mounting Brackets
Structural frames, angle brackets and compressor / fan-motor mounting plates that locate components inside the unit.
Fan Housings & Shrouds
Venturi rings, scroll/volute shells and fan shrouds that direct airflow and protect the wheel.
Access Panels & Doors
Hinged or removable service panels with handles, latches and gasket channels for maintenance access.
Filter Frames
Track frames and holding frames for panel, bag and HEPA filters, with seal lands sized to your filter format.
Drain Pans
Formed, sloped and sealed drain pans and secondary pans for coil condensate, with drain boss and float-switch provisions.
Louvered Panels
Ventilation louvres and intake grilles for airflow and weather screening on equipment casings.
Duct Interface Components
Transition collars, flanges and connection pieces where the equipment meets the site ductwork.
We also build related custom sheet metal enclosures for other equipment types — see our custom sheet metal electronics enclosures page for the broader capability, or the sheet metal fabrication services overview.
Scope note: we supply discrete components and sub-assemblies to the OEM's design. We do not engineer, fabricate or install complete duct systems, spiral duct runs or pressure-class field ductwork, and we do not perform on-site installation. We also do not certify individual components to system-level standards such as AHRI 1350/1351 or EN 1886:2025 — those apply to the complete air-handling unit as a system and are the responsibility of the equipment manufacturer.
Materials for HVAC Sheet Metal
HVAC sheet metal is usually one of four families. We specify the actual material standard and thickness in millimetres so there is no ambiguity at receiving inspection.
| Material (standard / grade) | Typical HVAC use | Notes |
|---|---|---|
| Cold-rolled steel (SPCC / EN 10130) | Enclosures, brackets, frames | Good formability and paint base; used where corrosion exposure is low. |
| Galvanized steel (DX51D+Z / ASTM A653) | Outdoor casings, pans, louvres | Zinc coating resists corrosion; coating mass selected per environment. |
| Aluminum (3003 / 5052) | Lightweight panels, louvres, heat-pump housings | Corrosion resistant, easy to form; 5052 for higher strength. |
| Stainless steel (304) | Washdown, coastal, high-humidity parts | Corrosion resistance where galvanized is insufficient. |
Gauge vs thickness: "gauge" is a regional naming convention, not a universal thickness standard — the same gauge number maps to different millimetres across systems (e.g. US vs UK/BG). We quote and machine to the actual thickness in mm (for example SPCC 1.5 mm, DX51D+Z 1.2 mm), so the drawing and the parts always agree.
Coating grades: galvanized coating designations — Z140 per EN 10346, or G60 / G90 per ASTM A653 — are available options selected per project against your specification; we confirm the required coating mass and standard on the drawing rather than assuming one.
For the full list of materials we work with, browse the materials hub.
Fabrication Capabilities
All components are produced on one floor: cutting, forming, joining and secondary operations under a single ISO 9001:2015 quality system, so the parts that meet at assembly are made to one standard.
Laser / plasma & punch
Fiber laser and plasma cutting plus CNC punching produce net-shape blanks with tight hole patterns.
CNC press brake
Panels, flanges, pans and seams bent to your bend schedule and tooling plan.
TIG / MIG & spot weld
Enclosures, frames and brackets assembled and welded on the same floor.
PEM · hardware · tap
Fasteners and inserts set, threads tapped, so the unit goes together cleanly.
Degrease & surface
Clean, coating-ready parts before any finish is applied.
Sub-assembly & kit
Components supplied as a built sub-assembly or kit where useful to you.
Where a component also needs machined features (e.g. a bracket with bored holes or a turned bushing), we coordinate that on the same floor — see our CNC machining services.
Tolerances & DFM for Sheet Metal
Sheet metal tolerances are driven by material, thickness and process, not applied as one number across the part. We confirm achievable limits at quote time against your drawing.
| Aspect | Typical capability | How we apply it |
|---|---|---|
| Bend angle | ±0.5° typical | Depends on material springback and tooling. |
| Bend-to-feature | ±0.2–0.5 mm | Measured from the bend line. |
| Flatness | Per part geometry | Large panels may need stiffeners or be checked on a flat table. |
| Hole diameter | ±0.1 mm (punched) | Taps and reaming applied as specified. |
| Weld shrinkage | Allowed in layout | Compensated in the developed flat pattern. |
Reference basis: dimensions are confirmed against your drawing together with ASME Y14.5-2018 / ISO 22081:2021 as applicable. ISO and ASME are related but not interchangeable, so the drawing states which standard applies rather than assuming one.
- Bend radius — keep the inside radius ≥ material thickness where possible to avoid cracking on galvanized or stainless stock.
- Bend direction — consistent directions simplify the flat pattern and reduce setup.
- Corner relief — add relief at formed-pan corners to prevent tearing at the bend.
- Hole placement — respect minimum hole-to-edge and hole-to-bend distances so features stay accurate.
- Functional vs cosmetic — tell us which features are functional so we prioritise tolerance spend there.
Surface Finishing
Finishing scope must be stated clearly so you know what we perform and what we coordinate.
| Finish | Scope | Notes |
|---|---|---|
| Degreasing & surface prep | In-house | Standard before any coating. |
| Passivation (ASTM A967) | In-house where qualified | Stainless corrosion layer; otherwise audited partner. |
| Galvanizing / zinc | Audited external | On galvanized stock or post-coat per spec. |
| Powder coating | Audited external | Colour and film thickness per spec. |
| Anodizing (Al) | Audited external | Type II / III per alloy. |
Honest boundary: degreasing and passivation (where the line is qualified) are handled in-house. Powder coating, anodizing and post-galvanizing are coordinated through audited external partners, with finish certificates available on request. Final finishing scope — including whether coating is performed in-house — is confirmed per project, so tell us your finish requirement when you request a quote.
Industries & Equipment We Serve
Air-handling units
AHU manufacturers — panels, base trays, filter frames and access doors.
Rooftop & packaged
Cabinet sheet metal and structural brackets for packaged units.
Fan coil & terminals
Housings, shrouds and mounting plates for fan-coil units.
Refrigeration
Drain pans, casings and brackets for cold-storage and display.
Heat pumps & chillers
Lightweight aluminum and coated steel enclosures.
Ventilation & exhaust
Louvred panels, grilles and duct interface parts.
For the wider manufacturing scope, see our manufacturing services overview.
Quality Control
One quality system spans cutting, forming, welding and finishing, with material-specific checks at each stage so your receiving inspection sees one standard.
- Incoming verification — material certificates and stock check against the order.
- First-article check — key dimensions verified before the run proceeds.
- In-process sampling — periodic checks to catch drift early.
- Weld & fit inspection — seams, angles and mating features checked.
- Flat-pattern verification — developed blank checked against the drawing.
- Finish verification — coating thickness and appearance confirmed.
- Final packing — clean, labelled and protected for transit.
Material mill/test certificates and inspection reports such as CMM reports or FAI reports per AS9102 (on request) can be supplied. We fabricate to your specification and do not claim third-party system certification for the finished equipment.
From RFQ to Delivery
RFQ & DFM
Review files, flag risks, suggest tolerances.
Quote & PO
Transparent quote; confirm material & finish.
Programming
Nesting, CAD/CAM and bend setup.
Cut & form
Laser/plasma cutting + press brake.
Weld & secondary
Join, PEM insert, tap.
Finish & QC
Coat (partner), inspect.
Pack & ship
Protected packing; worldwide.
Request a Quote
Tell us what you need and we return a drawing-based quote. The fields below are what helps us quote accurately — there is no form on this page; use the button to open our secure quote window.
Information that speeds up your quote
Send a 2D drawing and/or 3D model. The more of the following you include, the faster and more accurate the quote.
Note: this page intentionally carries no input form. Click Request a Quote to open our secure quote window, or email your files with the details above.
Frequently Asked Questions
What HVAC sheet metal components do you make?
Do you certify components to AHRI 1350/1351 or EN 1886:2025?
Can you work to a gauge thickness specification?
What materials do you use for HVAC sheet metal?
Do you powder coat in-house?
What tolerances can you hold on bent sheet metal?
What is your minimum order quantity?
How fast can you deliver HVAC sheet metal parts?
Do you provide material certificates and inspection reports?
What files do I need to send for a quote?
Ready to source your HVAC sheet metal components?
Send your drawing and we will return a transparent, drawing-based quote with material, thickness, tolerance and finishing options spelled out — from one prototype to production.
Xiamen Goldcattle Plastic & Metal Products Co., Ltd. — Founded in 1998 · Customers in 100+ countries · ISO 9001:2015 certified.
