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Whole-house fan
A whole-house fan is a type of fan, or exhaust system commonly venting into a building's attic, designed to circulate air in a home or building.〔Whole House Fan Defined, "http://www.homewyse.com/definitions/whole_house_fan.html"〕 It is sometimes confused with a powered attic ventilator, which exhausts hot air from the attic to the outside through an opening in the roof or gable at a low velocity.〔Attic Ventilator Defined, "http://encyclopedia2.thefreedictionary.com/attic+ventilator"〕
==Description==
A whole-house fan pulls air out of a building and forces it into the attic space. This causes a positive pressure differential in the attic forcing air out through the gable and/or soffit vents, while at the same time producing a negative pressure differential inside the living areas which draws air in through open windows.
Powered attic ventilators, by comparison, only serve to remove some hot air from the attic. Intake air comes directly from outside, instead of from the house interior. This system is used when air intake from the house is not desirable, such as when the interior is air-conditioned. Typical diameter is , having motors of power , and using 120 to 600 watts of electric power.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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