Oval ductwork is an efficient mode to transport air in HVAC systems and, like spiral pipe, is gaining popularity due to their contemporary aesthetic appeal and efficiency. Flat oval ductwork is made from slit metal that is spun into an interlocking seam, forming a spiral pattern pipe. The spiral pipe is then stretched out to the appropriate flat oval size. 

Our HVAC Oval Ductwork

Our oval ductwork is held together either by a standard lateral seam or a corrugated lateral seam. We offer a variety of options to meet whatever your needs might be, including double-wall.

Spiral Ductwork Standard Lateral Seam

Standard 5" Lateral Seam

Spiral Ductwork | Corrugated Lateral Seam

Corrugated 5" Lateral Seam

Choose from the following options:

Pipe Sizes

  • Based off of minor axis and major axis

Metal Type

  • Galvanized Steel (G-90)

  • Aluminum .032 & .040

  • Paint Lock* (24 ga & 22 ga)

  • Stainless Steel* (24 ga)

  • PVS*

Pipe Length

  • Any size from 12" - 240" (standard length is 120")

Metal Gauge

  • 18

  • 20

  • 22

  • 24

  • 26

Only select gauges are available with this type of metal.

Advantages of Oval Ductwork

If space is not an issue and efficiency and aesthetics are a priority, then oval ductwork could be your solution.


  • Lower fabrication cost - according to SMACNA duct design manual, oval is 25% the cost of rectangular duct.


  • More efficient HVAC system - the surface area of oval is much less than rectangular, which translates to less air friction and a more efficient system. (ie a 12" X 12" duct has a stretch-out of 48" which equates to a 13.1" round duct or a 41" stretch - a savings of nearly 15%).


  • Faster installation - traditionally rectangular ductwork is built and assembled in 5' sections, oval, however, is typically built and installed in 10' sections.


  • Lower installation cost - oval requires fewer connections than rectangular ductwork, which lowers margin for errors on properly sealing the joints - not to mention the time savings.


  • Less air loss - not only does oval ductwork require less transverse duct connections, but it has no longitudinal connections. At best, it has been difficult to achieve less than a 5% air flow loss with rectangular. Oval averages a 1-2% air loss.


  • Less noise pollution - oval ductwork absorbs the noise of the equipment far better than rectangular ductwork. Rectangular ductwork tends to reverberate sound throughout the system.


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.