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Old 08-11-2011, 08:29 AM   #1
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Attic Fan suggestions?

Im not sure if this is techncially HVAC or not, but anyway...

I would like to put in an attic fan (whole house fan). All of our prior houses had them and they are a great way to create a draft through the house when the windows are open on nice days.

I am well aware about framing and the electrical required, but I am not sure about brand quality, sizing, sound levels, etc.

The house is a 1650sqft ranch. The fan will be going in the main hallway that separates the bedrooms from the living areas.

It seems like there are two schools of thought out there now....smaller fans that provide a constant low flow of air (~1200cfm) or the largest fan you can fit in the hallway to quickly draw in air (~3500 cfm). Which way to most people lean to these days?



Last edited by redline9k; 08-11-2011 at 09:48 AM.
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Old 08-12-2011, 10:41 AM   #2
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You have to separate a whole house fan or whole house comfort ventilator which is designed to draw outside air through the house and cool it from an attic fan or powered attic ventilator which is designed to cool the attic. It sounds like you are interested in the former - cooling the house on cool summer nights. The really powerful fans that are located in a central hallway "suck" the air out of the house, causing it to draw air in through any hole intentional or unintentional - like an open window or down the chimney! They are generally pretty noisy, use a lot of power, and need to be carefully covered in the winter so as not to lose heat. There are smaller version of these - in the 1000 cfm range that often have motorized and insulated doors. These are quieter and more enery efficient but won't create a breeze through the house. There is another version that is ducted, drawing air from multiple rooms so that you can close the bedroom doors at night. These can be much quieter. They should be ducted all the way to the outside so that they don't over pressurize your attic and force the nasty attic air back down into your house. Make sure that windows are open any time you use any of these products. I have developed a number of these products over the past 30 years and you might be interested in an article on our website: Hope this is helpful.


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