Rectangular and square ductwork is the most common type of HVAC duct requested by mechanical engineers. It has earned its place in traditional HVAC. H. Lamm Industries’ rectangular and square duct and fittings meet or exceed SMACNA 3rd Edition 2005 standards.

Products Available Include
- Rectangular and Square Duct and Fittings
- Rectangular Slip & Drive/Bar Slip & Drive
- Rectangular TDC/Ductmate
- Rectangular & Square Double- Wall
- Rectangular & Square Lined
*Metals available are Galvanized G 60 and G 90, Stainless Steel, Aluminum, Paint Grip and Black Iron in Gauges 16 through 26
* Fiberglass available
* Shrink wrapped duct ends available upon request