| 摘要 |
A powered exhaust fan for ventilating structures, especially well suited for roof ventilation, provides a motor driven fan assembly supported by a support assembly beneath an opening in a roof structure. The fan assembly further includes an air deflector assembly housing an impeller driven by the motor. The air deflector assembly also includes an intake portion and an exhaust portion. The fan assembly is positioned so that rising warm air is drawn into the intake portion by the rotating impeller and is directed into the inner surface of the air deflector assembly, out of the exhaust portion and then out through the roof opening. The positioning of the exhaust fan below the roof minimizes the negative aesthetic impact of the exhaust fan and allows it to be installed with existing passive ventilation systems.
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