Spunstrand® Inc. has been developing and manufacturing underslab insulated and non-insulated HVAC ductwork along with Industrial corrosion resistant FRP products for chemical, wastewater, laboratory, plating, pulp, and paper industries for over 50 years.
Spunstrand® Inc. duct is manufactured using the filament wound method to provide the greatest strength for direct burial applications. A foil scrim kraft, or FSK, inner surface liner provides a UL class 1 rating for this product when used in underslab applications. It is available in standard round sizes 2” diameter through 96” diameter. Rectangular duct and FRP boots are options. Factory pre-insulated duct with listed and code approved R-values of R-4, R-6, R-8, R-10 & R-12.
Spunstrand® Inc. is capable of meeting your needs with a variety of customized products where composite materials solve challenging problems of your customers. We are the premier custom fabricator for duct design and engineering. If you can draw it, we can build it!