Attic fan
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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,
Powered attic fan installed underneath a roof
Wind-powered roof turbine ventilator
A weatherproof cap covering an attic fan
Whole-house fan
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A whole house fan is a type of fan, commonly venting into a building's attic, designed to circulate air in an entire house or other building. The fan removes hot air from the building and draws in coo
Attic fan
…49 °C). A fan may be installed in an attic for the purpose of cooling a whole house by venting hot air out via the attic. Such fans are often called whole-house fans. Mechanical attic ventilation fans may be powered in a variety of different ways. Most attic ventilators fitted to homes are powered by mains electricity…
A typical whole-house fan, with louvers closed when not operating
Fan unit before installation
Louvers open while fan is operating