Dundas Jafine’s Flexible Insulated Duct is UL 181 listed as a class 1 air duct and bears the UL mark.
This duct consists of a flexible helix core made of 2 ply polyester laminate and corrosion resistant galvanized wire.
It is surrounded by a blanket of formaldehyde free, fiberglass insulation, that helps to reduce heat and cool loss as well as jacketed by a heavy duty, fire retardant, black polyethylene vapor barrier.