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Attic Fan Ventilation

Attic Fan Ventilation

This calculator is designed to arrive at a reasonable attic or ceiling crawl space ventilation fan air volume displacement rating for minimum, normal and optimum outside heat conditions. This vent fan removes heated air from inside that space and should be placed near the peak to effectively remove the hottest air. The extreme conditions might be considered the normal use in extreme high heat areas. Enter the length and width of your attic or ceiling crawl space. Then enter the height at the highest point. Select if your roof is more flat of peaked. Then click on Calculate.

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