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An attic fan installed underneath a roof. A powered attic ventilator, or attic fan, is a ventilation fan that regulates the heat level of a building's attic by exhausting hot air. A thermostat is used to automatically turn the fan off and on, while sometimes a manual switch is used. An attic fan can be gable mounted or roof mounted. Additional ...
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A centrifugal fan is a mechanical device for moving air or other gases in a direction at an angle to the incoming fluid. Centrifugal fans often contain a ducted housing to direct outgoing air in a specific direction or across a heat sink; such a fan is also called a blower, blower fan, or squirrel-cage fan (because it looks like a hamster wheel).
Removed fan, on display at the Ebbw Vale Garden Festival. Note the évasée rim. Waddle fans, sometimes incorrectly spelled Waddell, [1] were large centrifugal fans, used to ventilate coal mines. They were noteworthy for their extremely large size and distinguished by an integral shroud for the fan, which makes it possible to mount them in the ...
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