Replacing attic fan


Old 08-24-14, 02:58 PM
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Replacing attic fan

I need to have my thermostatic roof top attic fan replaced but I have no idea what the roof opening is under the current one. How do I go about deciding what type to get? Taking the old one out first doesn’t seem to be a good option since it will leave an opening in the roof.

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Old 08-24-14, 03:43 PM
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I go into the attic space and measure the hole. You then calculate how many square feet of attic needs to be vented and buy the appropriate sized fan. However, I believe, for the most part, the fans are fairly standard in size of opening. They differ in CFM output which you match to the size of the space.
Old 08-24-14, 05:19 PM
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You may be able to repair what you have. Otherwise a roofer may be required as the existing fan is most likely going to be shingled/tarred in place.

Most of the roof vent fans are designed to fit the spacing between two roof rafters.

I use the Broan line of fans. They used to be Nutone but now they fall under the Broan name.
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