Downside of an Overpowered Attic Fan?


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Old 07-02-08, 10:58 AM
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Downside of an Overpowered Attic Fan?

Our attic fan worked only 2 or 3 years before making noises. And its thermostat failed to work correctly now. It would usually be on unless we manually switch it off - luckily we added a switch when first installing it.

So, we want to upgrade it to a slightly better and hopefully more durable model (from a 1000 CFM model to the 1250 CFM model). However, the better and more durable model would also mean a more powerful fan motor designed for a bigger attic, and that would require more soffit vents which we don't have.

What would happen if we install the more powerful attic fan anyway (without adding more intake vents)? We don't have air conditioning in our house, so I don't think we would lose any cooled air from inside the house (getting sucked up into the attic through leaks by the more powerful attic fan).

Is there any other downside to using the overpowered attic fan?

Thanks for help in advance.
 

Last edited by DIYaddict; 07-02-08 at 11:06 AM. Reason: Duplicate post deleted in Roofing, Gutters & Waterproofing
  #2  
Old 07-04-08, 09:33 PM
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Wink

You do want to match the cfm in and out of the attic. Sq ft of attic X 0.7 === CFM of fan
 
 

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