It is widely used at venting pipe and air-blower outlet in building material, glass, mining, power, light industry and papermaking departments. It adjusts flow in pipe by different working conditions.

When in use, the exhaust blower is opened and stench can be discharged through the sucking hole, the passage and the gas outlet.

The utility model is equipped with a deodorizer on an ordinary water closet. The deodorizer comprises a blower, an inlet air duct and an outlet air duct;