Strong polyester film laminated and encapsulating a heavy, corrosion resistant steel wire helix, forms the inner core and supports a thick blanket of fiberglass insulation. The outer vapor barrier is a bi-directional, reinforced metallized vapor...
Non-insulated UL181 Class 1 flexible air duct, extremely strong with doucle laminated polyster film permanently bonded to a corrosion resistant spring steel wire helix, for all pressure heating and cooling systems. A superior alternative in...