... flex duct1,Material: PVC flam-resistant static-free fabric with steel wire reinforced.2.PVC Thickness:0.3mm-0.45mm ... green ect.5,Character: enduring high temparature,acid,alkali,oleic acid, harmful liquid state gas ect.Temperature range:from -15°Cupto ... working.with the strap or pp rope can conveniently connect to the portable ventilator to use together. high temperature flexible duct with metal ring