1.Material:aluminum foil 2.it can be 23times longer after stretch 3. high temperature resistant 4.can be for hot air Good Flexible Aluminum Foil Duct For Ventilation System 1.Material:aluminum foil2.Features:aluminum foil with steel wire inside,perfect flexibility,extension rate 1:23,temperature range:-30 to 140 degree.max air flow:30m/s,max operation pressure:2500pa.3.Application:used in hgih ...