Quality, Commitment, Service, and Satisfaction


Exclusive Mid-Atlantic Distributor

When looking for a lightweight energy efficient venting system look no further than Thermaduct!

Today Thermaduct is being used on important projects like hospital expansions and any buildings with rooftop units requiring outdoor ductwork running across the roof or down the side of a building. It’s some 70 percent lighter than double wall duct and requires no insulation or weather shield as single wall or double wall duct would require.

It also is available in several colors making it aesthetically more appealing without requiring any painting.

Thermaduct provides high quality insulated ductwork systems to both interior and exterior installations. Our family of pre-insulated products are designed and manufactured to increase the efficiency of the application with higher R-values and lower air leakage, while at the same time increase installation efficiency with lightweight duct systems that require no additional insulation or wrapping. Whether on the roof, or inside the building a pre-insulated duct can cut installation time and save on long term energy costs.

  • R8 – R24 Insulation Values
  • Up to 75% lighter
  • Low Air Leakage
  • High Static Pressure Design
  • Fast Installation


Our family of innovative, pre-insulated duct systems will support just about any application. Our products use the highest quality closed cell phenolic to give customers the best insulation value without taking up valuable interior or exterior space. By ordering Thermaduct or KoolDuct, you can be confident that you’ll receive a lightweight, low air leakage and high R-value product that is backed by a 10-year limited warranty.

Ideal for:

  • Outdoor Rectangular or Round
  • Indoor Rectangular or Round
  • Indoor Round or Spiral

Lowering the “Carbon Footprint”

We believe that high efficiency should not stop at your HVAC equipment, but rather should encompass the entire management of energy through intelligent controls and efficient air distribution. Thermaduct offers a more efficient air distribution system, promoted by employing fiber free Kingspan KoolDuct. With higher thermal values and lower air leakage than traditional air distribution systems, you’ll notice a difference with Thermaduct ductwork products for your indoor and outdoor applications.

With all of our pre-insulated systems, air passes over the smooth aluminum surface of Kingspan KoolDuct’s closed cell phenolic panels, with a variety of additional lining options should an application require it.

For more information:

Stromberg Metal Works, Inc.
6701 Fleetwood Drive
Raleigh, NC 27612
Ph: 919-781-2515
Email: [email protected]