Cabinet & Wall Panels
Double-wall insulated panels — solid inner skin, outer skin, and foam insulation between — for thermal performance and acoustic damping, with double-flanged edges for rigidity.
HVAC · Climate Control
HVAC & RTU
HVAC & RTU
Enclosure
Fabrication
Custom HVAC cabinets — rooftop unit (RTU) enclosures, air handler casings, and condensing unit housings — in galvanized steel, stainless, and aluminum. Double-wall insulated, weatherproof, low-leakage construction with access doors and drainage. We build the sheet metal cabinet; you integrate the coils, fans, and refrigeration.
✓ Double-wall insulated
✓ Low air leakage
✓ Integration-ready
OEM leakage target
2-wall
Insulated Panels
RFQ
Finish Test Scope
OEM
Leakage Target
G-90
Galvanized Steel
01 / What We Fabricate
The HVAC Cabinet — Weatherproof Housing for the Equipment
An HVAC unit's cabinet has to keep weather out, hold insulation, seal against air leakage, and open up for service. We fabricate the sheet metal enclosure, built around the coils, fans, and components you'll integrate.
Base Rails & Frame
Heavy-gauge galvanized base rails and frame that carry the equipment and seal to the roof curb — the structural foundation of the unit.
Access Doors & Panels
Insulated, hinged access doors and removable panels with rain-break overhangs and weathertight seals — so technicians can reach filters, coils, and controls.
Drainage & Openings
Sloped roof sections for drainage, condensate pan provisions, and sealed openings for piping, conduit, ductwork, and fan discharge.
Our scope: the sheet metal cabinet
We fabricate the HVAC enclosure — wall panels, base rails, access doors, drainage, and openings — formed, welded or riveted, insulated, and finished, ready for equipment integration. Bought-out components such as compressors, evaporator and condenser coils, fans and motors, the refrigeration system, heating elements, and controls/DDC are integrated by you or your assembly partner. We build the cabinet with openings and provisions sized to your equipment.
02 / Enclosure Types
Cabinets for Every HVAC Platform
We fabricate the enclosure for the full range of HVAC equipment, to your design and specification.
RTU Rooftop Unit (RTU) Cabinets
Self-contained rooftop unit enclosures — robust, weatherproof cabinets that house the complete packaged system for outdoor roof mounting.
- Use Packaged rooftop HVAC
- Material G-90 galvanized steel
- Build Double-wall insulated
AHU Air Handler (AHU) Casings
Modular air handling unit casings with double-wall insulated panels — low-leakage, low-deflection construction for indoor and rooftop air handlers.
- Use Air handling units
- Panel Double-wall, low-leak
- Format Modular sections
Condensing Condensing Unit Housings
Outdoor condensing unit enclosures with ventilation grilles and louvers, weatherproof construction, and corrosion protection for the field.
- Use Outdoor condensing units
- Material Galvanized / aluminum
- Feature Ventilation louvers
Outdoor Outdoor Equipment Enclosures
Custom weatherproof enclosures for outdoor HVAC and climate-control equipment — DOAS, makeup air, and specialized units to your design.
- Use DOAS, makeup air, custom
- Rating Weatherproof
- Build Insulated, sealed
03 / Technical Capabilities
Weatherproof, Insulated, Low-Leakage
An HVAC cabinet has to seal against air leakage, insulate, survive the weather, and stay rigid under static pressure. Here's what we fabricate to.
| Materials | G-90 galvanized steel; aluminized steel; stainless (drain pans); aluminum |
|---|---|
| Panel Construction | Double-wall — solid inner skin, outer skin, foam insulation between (e.g. 2 in.) |
| Air Leakage | Buyer-defined leakage target; the OEM or selected test party owns configured-unit testing and performance validation |
| Panel Deflection | Stiff panels — deflection targets (e.g. L/240) under design static pressure |
| Corrosion | Drawing-defined coating system; any ASTM B117 method, duration and acceptance criteria are set by the buyer and validated by its test party |
| Sealing | Continuous seals between panels, doors, and openings; sealed piping/conduit entries |
| Access | Insulated hinged doors, removable panels, rain-break overhangs, weathertight seals |
| Drainage | Sloped roof sections, upturned base-pan flanges, condensate pan provisions |
| Construction | Machine-formed for precision; welded or pop-riveted; self-locking seam options |
We fabricate the cabinet to your drawing, with openings and provisions sized to your equipment. Compressors, coils, fans, motors, refrigeration, heating elements, and controls are integrated by you or your assembly partner.
04 / Manufacturing Process
From Galvanized Sheet to HVAC Cabinet
An HVAC cabinet lives or dies on sealing, insulation, and weatherproofing. Our process delivers a cabinet that's airtight, rigid, and field-ready.
01
DFM & Layout
Review your equipment layout and specs — confirm material, panel construction, insulation, opening positions, and the sealing and drainage approach.
02
Laser Cutting
Fiber laser cutting of panels, base rails, and all openings — for coils, fans, ductwork, piping, conduit, and access doors, to precise position.
03
Forming
CNC press-brake forming — double-flanged edges for rigidity, machine-bent for precise assembly, with self-locking seams where specified.
04
Assembly & Insulation
Welding or pop-riveting the cabinet, building double-wall insulated panels, installing access doors with seals, and continuous sealing against air leakage.
05
Finishing
Galvanized, pre-coated, or powder-coat finish — with drawing-defined corrosion protection for outdoor durability in the field.
06
Inspection
Dimensional inspection of openings and mounting, panel fit, seal integrity, and finish inspection before delivery for your equipment integration.
05 / Why It Matters
What Makes an HVAC Cabinet Perform
The cabinet determines whether the unit is efficient, quiet, and durable. Four things separate a good HVAC enclosure from one that wastes energy and fails early.
Low Air Leakage
Conditioned-air leakage affects system efficiency. The HVAC OEM defines the allowable leakage, test method and acceptance criteria; DRAmetal does not claim a fixed percentage.
Insulation & Rigidity
Double-wall insulated panels reduce thermal loss and noise, and resist deflection under static pressure — a flexing panel leaks and transmits noise.
Weather & Corrosion Protection
Rooftop units face sun, rain, snow and wind. Drainage, sealing and coating requirements must follow the buyer's site exposure and service-life target; the OEM owns environmental validation.
Serviceability
Technicians need to reach filters, coils, and controls. Insulated access doors with weathertight seals and rain-break overhangs make service fast without compromising the seal.
Customer Project
Commercial HVAC Housing: Panel Fit and Outdoor Finish
Materials, fabrication decisions and results for an anonymous customer project.
Component reference image
The Customer Challenge
Corrosion, weak fan-guard stiffness and large assembly gaps affected the original housing.
Project Measurements & Details
IPX4Water protection
≤0.5 mmAssembly gap
1.2 mmGalvanized sheet
Results apply to the project configuration described on the linked page.
Read the Customer Project → 07 / Why Choose Us
Why OEMs Trust DRAmetal for HVAC Enclosures
01
Double-wall construction
Insulated double-wall panels for thermal performance, acoustic damping, and rigidity under static pressure.
02
Low-leakage sealing
Continuous sealing and tight construction that holds cabinet air leakage low — protecting unit efficiency.
03
Weather and coating inputs
Sloped drainage, sealed openings and finish details follow the released drawing. Corrosion targets and any salt-spray validation are buyer-owned.
04
Serviceable access
Insulated hinged doors with rain-break overhangs and weathertight seals for fast field service.
05
Integration-ready
Openings and provisions sized to your coils, fans, refrigeration, and controls for clean assembly.
06
Prototype to volume
From a first cabinet through OEM production runs, with consistent panel fit and DFM feedback.
08 / Related
Explore More
09 / FAQ
HVAC & RTU Enclosure FAQ
Do you build complete HVAC units or just the cabinet?
We fabricate the sheet metal cabinet — wall panels, base rails, access doors, drainage, and openings — insulated, sealed, and finished. Compressors, coils, fans, motors, the refrigeration system, heating elements, and controls/DDC are integrated by you or your assembly partner. We design the cabinet with openings and provisions sized to your equipment.
What is double-wall construction?
A double-wall panel has a solid inner skin, an outer skin, and foam insulation between them (commonly 2 inches). It provides thermal insulation, acoustic damping, and rigidity — far better than a single-skin panel for performance and durability.
How do you control air leakage?
Through tight construction and continuous sealing between panels, access doors, and openings, plus sealed piping and conduit entries. The HVAC OEM owns the leakage target and system test; DRAmetal fabricates and inspects the released mechanical interfaces.
Are the enclosures weatherproof and corrosion-resistant?
We can fabricate drawing-defined drainage, openings, door overhangs and coating interfaces. The buyer specifies the material and finish. Any ASTM B117 method, duration, acceptance criteria and completed-unit weather validation remain with the OEM or selected test provider.
Can you match our existing unit design?
Yes — send us drawings or a sample and we'll fabricate the cabinet to match, including panel construction, access door layout, opening positions, and provisions sized to your coils, fans, and components.
What's your minimum order quantity?
We support everything from a single cabinet to OEM volume production. Send us your unit design and requirements and we'll confirm MOQ and pricing for your project.
Get Started
Need an HVAC or RTU
Need an HVAC or RTU
Cabinet Fabricated?
Send us your unit design, equipment layout, and environment. Our engineering team will review the submitted information and, where the scope is complete, provide a DFM review, a material, insulation, and sealing recommendation, and a quote for the sheet metal cabinet.
✓ RFQ-based DFM review ✓ Double-wall insulated ✓ Low air leakage ✓ Integration-ready