EHG is a spiral duct and fitting manufacturer with representatives across the USA. In addition to the company's superior G-3 gasketed duct system, EHG offers project management, special packaging, racking, online submittals and much more.

Gustafson is a spiral duct and fitting manufacturer that markets to wholesalers and dealers. The company offers conventional air duct systems, as well as self-sealing and high velocity HVAC duct systems.

Linx Industries, a division of DMI Companies, is North America’s leading manufacturer of commercial HVAC ductwork and fittings. Linx Industries provides the construction market with residential, commercial, and industrial air distribution solutions. Linx operates from its manufacturing hub in Portsmouth, Virginia