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Old 11-02-2015, 05:11 PM   #1
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Whole House Fan cover question


I purchased an attic fan cover for the winter months to help against heat loss and one side has foil on it. Now for radiant heat barrier I know the foil needs to face an airspace, which would be the living space but in the directions and in the picture it shows the foil facing the shutters of the attic fan. What do you suggest?
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Old 11-02-2015, 06:15 PM   #2
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The facing direction will depend on the season. In the summer when the attic temperatures are the Hotter temperatures the foil should be facing the attic. Exact opposite in the winter.
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Old 11-02-2015, 11:54 PM   #3
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I would follow the picture, if the fan is located in the attic floor. The vapor barrier foil will stop moisture coming from the heated room to the attic. IF the foil was on top the insulation in the winter (when you use the cover), it could trap moisture to condense or even freeze on the insulation side as the attic is almost as cold as ambient temps.

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