... length:5m or 10m4,Main color: yellow,red,orange .white,black,green ect.5,Character: enduring high temparature,acid,alkali,oleic ... can conveniently connect to the portable ventilator to use together. PVC flexible duct:/air duct/exhaust duct,ventilating duct,flex duct 1 ... length:5m or 10m4,Main color: yellow,red,orange .white,black,green ect.5,Character: enduring high temparature,acid,alkali,oleic ...