... Sound absorption Zip &Velcro connection Insulated duct, ventilation duct, air conditional duct, insulated flexible duct1,Material: PVC flam-resistant anti ... Main color: yellow,red,orange .white,black,green ,blue ect.5,Character: enduring high temparature,acid,alkali,oleic acid, harmful liquid ... Widely used in these working environment such as engine room,air port,hotel,supermarket air-conditioner ect