BOX-TYPE EXHAUST FAN

The present invention discloses a box-type exhaust fan comprising a main box body. The main box body is mounted to a base, and universal wheels are mounted at four corners of the bottom of the base; a fan body is provided in the main box body, the fan body comprises a housing and an impeller, the impeller is fixed in the housing, the impeller is connected to a motor via a rotating shaft, one side of the housing is provided with an air inlet, the other side is provided with an air outlet, and the air inlet and the air outlet extend out of the main box body; the air inlet is provided with a sound-deadening ring, the air outlet is connected with a sound-deadening pipe, and the inner wall of the housing is provided with a first sound-absorbing layer. The present invention uses a combination of multiple sound-deadening structures, such as a sound-deadening ring, a first sound-absorbing layer, a sound-deadening pipe, etc. to achieve multiple sound-absorbing and noise-reducing so that the noise is greatly reduced and the noise pollution is reduced.