FIELD: ventilation.
SUBSTANCE: invention relates to ventilation, in particular to fans. Roof fan includes a housing in which there are located: a motor, including a shaft, a hub connected to the motor and including channels located around the motor shaft, an impeller connected to the hub, cooling impeller connected to engine, wherein cooling channels are made between the cooling impeller and the engine, while in the upper part of the housing there are openings for introducing outside air into the housing, and near the impeller there are openings in the housing for removing air.
EFFECT: provision of possibility of fan self-cooling during operation and increase of cooling efficiency due to increase of cooled area at low power consumption for cooling.
19 cl, 11 dwg
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