Rectangular ductwork is used as main trunk lines in a HVAC system. This ductwork is perfect when ceiling space is a concern, rectangular ductwork maximizes the space above the ceiling. We also offer double wall rectangular ductwork for sound and loss reductions.

Our Rectangular Ductwork

Our rectangular ductwork is most commonly built in "L" sections, requiring two sections to complete one full joint of duct. We also offer wrap-around duct and  4 - section rectangular duct as well. Our longitudinal seam are either pittsburgh or snap-lock.

Rectangular Ductwork | Snap-lock Seam

Snap - lock Longitudinal Seam

Rectangular Ductwork | Pittsburgh Seam

Pittsburgh Longitudinal Seam

Choose from the following options:

Rectangular Duct Size

  • 1 Piece - wrapper duct (small duct)

  • 2 Piece - L shape duct (medium duct)

  • 4 Piece - panels (large duct)

Metal Type

  • Galvanized Steel (G-90)

  • Aluminum .032 & .040

  • Paint Lock* (24 ga & 22 ga)

  • Stainless Steel* (24 ga)

  • PVS*

Rectangular Duct Length

  • Custom Lengths

  • Slip & Drive Joint - 59" 

  • TDC Joint - 56"

Transverse End Types

  • TDC

  • Slip & Drive

  • Furnace Flange (1/2", 1")

  • Raw 

  • 1" Flange

Only select gauges are available with this type of metal.

Advantages of Rectangular Ductwork

If you are tight on space and are totally enclosed above the ceiling, then rectangular duct could be your best option.

  • Low Pressure - lower pressure rectangular duct performs very well in rectangular ductwork.

  • Options - although spiral is becoming a very attractive alternative to rectangular/square duct, it does have some limitations. Spiral seems to fall short on options for liner, acoustics, strength and sizing constraints.

  • Height Requirement - rectangular ductwork maximizes the space above ceiling, allowing for larger, stronger duct.

  • Taps - traditionally HETO (high-efficiency take-offs) are more readily available than round taps, due to the custom sizing of round.


United Team Mechanical products are manufactured in accordance with the latest SMACNA, ASHRAE and SPIDA standards. In an on-going effort to improve our products, United Team Mechanical reserves the right to revise the design and/or specifications of its products as technology advances or applicable standards change.