Set up in building no outside indoor dustproof exhaust device of convection current wind in outer wall

The utility model discloses a set up in building no outside indoor dustproof exhaust device of convection current wind in outer wall, including ferrule and axial fan, the ferrule is the inside straight connector that is equipped with annular retaining ring, and axial fan's shell sets up to cylindrical, inside axial fan inserts the ferrule, and axial fan's the shell external diameter and the internal diameter phase -match of ferrule, axial fan's one end is blocked by the annular retaining ring of ferrule, has offered the aperture on the periphery of ferrule, and axial fan's wire passes the aperture, the equal fixedly connected with check valve in both ends of ferrule, the check valve at ferrule and its both ends all sets up in order to form the ventiduct in the building outer wall, and theorientation of opening of check valve is opening to building outer wall outside orientation. This device installation does not have against the wind simply, at leisure, the low power dissipation, andlow in cost adds the dual