... conductivity Sound absorption Zip &Velcro connection Insulated duct, ventilation duct, air conditional duct, insulated flexible duct1,Material: PVC flam-resistant anti ... ,oleic acid, harmful liquid state gas ect.Temperature range:from -15°Cupto +100°C.with the strong points of reducing heat ... . Widely used in these working environment such as engine room,air port,hotel,supermarket air-conditioner ect