Dundas Jafine Flexible Insulated Duct 4″ x 10′ R4.2 Silver Jacket

Dundas Jafine SPC410 Flexible Insulated Ducting 4" X 10' with 4.2 R insulation factor. Use in general ventilation applications including heating, air conditioning, intake and exhaust. Ideal for attic installations. Dundas Jafine’s Flexible Insulated Duct is UL / cUL 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,…