Duct Components


Founded in 1928 as a sales organization focused on HVAC contractors in Southern California, Pottorff's shift to manufacturing in 1971 remains anchored by a desire to deliver quality products, on time, at competitive prices.  Shipping from two factories, our dependable service is backed by an industry leading 5-year product warranty, exceptional Quick Ship capabilities and an experienced staff and versatile product line. We adhere and exceed the most stringent codes set forth by industry organizations and enjoy a strong partnership with the Sheet Metal Workers International Union.


GSI is a manufacturer of commercial Pipe and Fittings for the HVAC market. GSI’s mission is to be the market leader in product consistency, service, and innovation for low-pressure and medium-pressure duct systems. The organization has been supplying these products to markets from Maine to Florida and as far west as Kansas since 1998. The company has grown year over year by partnering with DMI’s distribution partners throughout the markets which it serves.


Ductmate Industries Inc. is one of the largest HVAC connector, component, and accessories manufacturer in North America, making it one of the largest in the world. Ductmate products are sold through a network of over 400 distributors in the U.S.A. and through a consortium of manufacturers and distributors around the world. Ductmate makes it easy to find, order and take delivery of all of our superior HVAC products.


Flexmaster U.S.A.®, located in Houston, TX, is a leading commercial HVAC flexible duct and sheet-metal fitting manufacturer with over 35 years of success in the industry. Our Flexmaster U.S.A.® HVAC product line of Air Distribution Solutions includes: flexible ducts, acoustical ducts, sheet-metal fittings, access doors, low leakage access doors and accessories for both commercial and residential applications.