The Global Industrial High Heat Flexible Ducting is your solution to transporting hot air over distances for safe, efficient temporary heating. Constructed from PVC with a high-temperature resistant coating and fiberglass reinforcement on the black end, this ducting is designed for use with portable heaters with a 14" flange. It has a 5-1/2" pitch and is able to withstand temperatures from -20 Deg to 302 Deg F. Meets UL94 VTM-0 flammability requirements. Limited 1-Year Warranty. Features 14 in. Dia. x 25 ft. High Heat Flexible Duct for Portable Heaters. Rated for use in temperatures up to 302 Deg F at the heater connection. Constructed from high-temperature resistant PVC. 25'L ducting with a 14" flange. Black end of the ducting connects to the heater. Yellow end (the outlet) is rated for up to 180 Deg F.