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For example: 2 story house, 20' x 30' with 8' ceilings. A 16 in. 3 spd
fan from Graingers (~3000 cfm on hi speed) is mounted in the trap door to
the attic with a venting window in the attic open.
This has proved effective. Having the fan in the attic is responsible for
the quick cooling to some degree; hot air tends to rise and a fan
pushing out a window moves it less directly.
Hul
In alt.building.construction Lacustral
<lark@adore.lightlink.com> wrote:
> I would like to use an exhaust fan (fan from a ceiling grille to outside) to
> run overnight in the summer, with the windows open, so that my house is cool
> in the morning. I am not sure how much CFM is needed. I do not want a big
> powerful whole house fan because I would like it to be quiet. Just a small
> fan that keeps running overnight.
> If you're using a fan for that purpose, can you tell me how much CFM gets
> your house down to the temperature of the outside air, and how many cubic
> feet of airspace you're ventilating, and how long does it take to cool
> the house down to the outside temperature?
> Just trying to get a ballpark idea.
> (I could calculate the cubic feet of airspace in my house, divide by CFM
> of a fan, and come up with a guess, but I am sure it's not that simple -
> the hot stuff in the house is heating up the air, fans aren't completely
> efficient about clearing out the inside air, etc.)
> Thanks
> Laura
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Re: fanpower needed to cool house overnight
