Properties- Aluminum Air Duct is made of aluminum. High flexibility and axial compressibility , extension rate is 1: 3.7- Temperature range : -30° C + 140° C- Maxim Air Flow: 30m/s- Maxim working pressure: 10000 paApplicationThe aluminum Chimney air duct hose is especially ideal for high pressure and low pressure ventilation system, like range hood.It can be fixed directly on the fitting. In case of fire or high temperature, there is no toxic gas.