Spiral ductwork is the most efficient mode to transport air in HVAC systems, and spiral pipe is gaining popularity due to its contemporary aesthetic appeal and efficiency. Spiral ductwork is made from slit metal that is spun into an interlocking seam, forming a spiral pattern pipe. 

Our HVAC Spiral Ductwork

Our spiral ductwork is held together with 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.

Standard 5" Lateral Seam

Corrugated 5" Lateral Seam

Choose from the following options:

Pipe Diameter

  • 4" - 24" in every nominal increment 

  • 24" - 56" in 2" increments

  • 60" 

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 Spiral Ductwork

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


  • Lower fabrication cost - according to SMACNA duct design manual, spiral is 60% the cost of rectangular duct.


  • More efficient HVAC system - the surface area of spiral 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, spiral, however, is typically built and installed in 10' sections.


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


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


  • Less noise pollution - spiral 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.

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