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Old 04-25-2012, 03:29 AM   #1
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Looking for an attic exhaust fan smaller than 14".


Looking for an attic exhaust fan smaller than 14". My attic is cut up into 3 sections of about 700 Sq. ft. ea. I think the standard fan is over kill. Now were I can find something smaller? Thanks.

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Old 04-25-2012, 03:56 AM   #2
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Looking for an attic exhaust fan smaller than 14".


The solar powered units move a lot less air.

Might be a better fit for running 3 smaller units.

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Old 04-28-2012, 09:12 PM   #3
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Looking for an attic exhaust fan smaller than 14".


How is the attic insulation? Solar fan pay-back years; http://www.fsec.ucf.edu/en/publicati...SEC-GP-171-00/

http://epics.ecn.purdue.edu/hfh/_tea...larresults.htm

Gary

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Old 04-28-2012, 11:01 PM   #4
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Looking for an attic exhaust fan smaller than 14".


Why not go with a ridge vent instead. No power needed, no noise, noting to break down, will give you far more air movement.
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Old 04-29-2012, 08:55 AM   #5
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Looking for an attic exhaust fan smaller than 14".


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Originally Posted by joecaption View Post
Why not go with a ridge vent instead. No power needed, no noise, noting to break down, will give you far more air movement.
I have ridge vents and full soffit vents on my roof, front and back. The original ridge vent was perforated metal; the replacement (with re-roofing) was Cobra type. The soffits are perforated metal. All of them are open.

With either vent, I have never been able to demonstrate ANY airflow either into the soffit or out of the ridge. On a summer day, it's hotter than hell up there.

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Old 05-01-2012, 01:01 AM   #6
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Looking for an attic exhaust fan smaller than 14".


The perforated metal soffit vents get clogged with dirt, limiting their function- better to use continuous venting near the fascia board. Scroll back a few pages and read the chapter on "Attic ventilation":http://books.google.com/books?id=Z8a...0vents&f=false

Some of the soffit vents are only 6-7NFVA per foot, rather than 9 as the continuous; http://www.certainteed.com/resources...tspecsheet.pdf

The Cobra would not be my first choice: http://www.buildsite.com/dbderived/a...rived20936.pdf

Other info: http://www.inspectapedia.com/interiors/atticcond10.htm

Another source; http://www.oikos.com/esb/30/atticvent.html

Is the attic air-sealed from the conditioned rooms below? Is the crawl air-sealed at the floor-line of wiring/plumbing holes to counter the stack effect?

Gary

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