... -static fabric with helix steel wire reinforced covering a lay of aluminum foam.2. Thickness: 5mm.3,Diameter:4" to 40 ... range:from -15°Cupto +100°C.with the strong points of reducing heat wasting reduction,low wind resistance,good nosie elimination ... . Widely used in these working environment such as engine room,air port,hotel,supermarket air-conditioner ect