... insulated duct for air conditioning Fire-retardant material Low thermal conductivity Sound absorption Zip &Velcro connection Insulated duct, ventilation duct, air conditional duct, ... ,acid,alkali,oleic acid, harmful liquid state gas ect.Temperature range:from -15°Cupto +100°C.with the strong ... used in these working environment such as engine room,air port,hotel,supermarket air-conditioner ect