Straight Duct
Rectangular straight sections. 2"–48" W×H, 6"–120" long.
Round Duct
Cylindrical duct sections & reducers. 2"–48" diameter.
Square to Round
Rectangular-to-round adapters for mixed duct systems.
Elbow
90° rectangular elbows with configurable throat radius.
Tee
Trunk-and-branch tee fittings for airflow distribution.
Transition
Rectangular-to-rectangular size transitions for trunk reductions.
Reducer
Symmetric reducers for downsizing duct runs.
Return Boot
Furnace return air boots with optional filter slot.
Offset
S-shaped offsets to navigate around obstacles.
Wye
Y-shaped fittings for balanced 2-way splits.
End Cap
Flat caps to seal unused duct openings.
Cross
4-way cross fittings for complex distribution.
Premium Custom HVAC Duct Fittings — Made to Order
PMX Ductwork fabricates custom sheet metal duct fittings for residential and commercial HVAC systems. Every fitting is precision-cut and formed to your exact specifications using our parametric 3D design engine. Choose from galvanized steel, aluminum, or stainless steel in 26, 24, 22, or 20 gauge.
Materials & Gauges
Galvanized Steel is the industry standard for most residential and commercial HVAC installations. Our galvanized duct fittings resist corrosion and provide decades of reliable service. Aluminum fittings are 65% lighter, ideal for rooftop units and suspended installations. Stainless Steel delivers maximum corrosion resistance for clean rooms, commercial kitchens, and marine environments.
Connection Types
Every fitting is available with your choice of connection type on each end: Raw (plain edge), Slip (friction-fit overlap), Drive (drive cleats), TDC (transverse duct connectors), or Flanged (bolted flanges for high-pressure systems).
Design Your Fitting Online
Use our interactive 3D designer on any fitting page to specify exact dimensions, material, gauge, and connections. See a real-time 3D model, CAD drawing, and instant pricing. Or use voice input to describe your fitting in natural language and let our AI configure it automatically.
Why PMX Ductwork?
Fabricated in Pennsylvania's Allegheny Mountains since 1997. Every fitting is cut on CNC equipment, formed on precision brakes, and inspected before shipping. We handle single fittings through full commercial jobs. Same-day quoting and fast turnaround on every job.