ducting
dundas jafine inc. 4inch x 25 black jacket insulated air duct bpc425
air duct flexible helix core with 2 ply polyester laminate and corrosion resistant zinc wire glass fiber insulation helps to reduce heat and cool loss fire retardant black polyethylene vapor barrier can be installed in place of galvanized pipe in most applications ideal for general ventilation applications including heating air conditioning intake and exhaust r4 2 insulation 4 x 25 length 9 width 30 height 9 sku jnsn36608