Specifications >> this fan comes with 5 inch diameter, 2200 rpm, strong airflow 141 CFM, voltage 220V, power 16W, withstand 40 high temperature. Widely used >> increase airflow in HVAC system to eliminate exhaust and odors in bathroom, shop, basements, attic, grow tent, etc. Multiple advantages >> special motor for ventilator, high quality anti-rust copper material and ABS case, smoothly works with lower noise, built-in temperature protection, it will auto stop while overheat, more safe. Easy to install >>installed with 5 inch ventilation pipe or in the wall, the 16 inch cable, brown live wire, blue neutral wire, please fix the fan to avoid the noise caused by looseness. In order to easy to extend the wire, the fans didn't wire plugs. Commodity name pipeline pressure fan Noise: 34db Rated voltage: 22V Wee volume: 130m3/h The rated frequency; 50Hz Product specification: 4 inches Commodity power: 12W Outlet: 100 (taking over size) Speed: 2400R/min.Items from Sheng Xinshun's shop