Speedi-Products EX-AFD 525 5-Inch Diameter by 25-Feet Length UL 181 Aluminum Foil Duct Speedi-Exhaust Products are made in the USA Ideal for non insulated general purpose venting systems Multi-ply metalized polyester and aluminum polyester laminate with steel wire support Seal joints with approved duct mastic sealants and tapes Consult your local building codes for approved installation practices