I’m building a house with a SIP roof–no attic. I want to install a whole-house fan on an outside wall. I haven’t been able to find any through-the-wall fans that have the high CFM ratings of whole house fans. (I’m looking for around 3500 CFM.) Is this just not done? What am I missing? Thanks!
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Replies
Where's the makeup air going to come from? That flow rate would expel all the air in my house in 4 minutes.
>Where's the makeup air going to come from? That flow
>rate would expel all the air in my house in 4 minutes.
The idea is to use the fan as a whole house fan, to bring cool air in through the open windows on summer nights. Just like the fans that are normally installed in the ceiling.
I have one in my house (a moble home with walls around, truss roof over, small attic). I made it myself and it WORKS GREAT!
It consists of a Patton or (similar) Windmere (50$) approx 15 inch high speed fan. I cut a circle in a 3/4 plywood which sets in a flashed window-like jamb. Outside are louvers which open with a choke cable inside.
In the winter we install a piece of foamboard.
Except for those few scorchers I think it is far better than sleeping in air condx.
If you want a big cfm fan go to a company that sells grain drying equipment for grain bins. You may have to add some supports to the wall but it will exchange the air for you.
FWIW, I sometimes see a jury rigged furnace blower used that way
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HI, Consider a greenhouse fan. Search for commercial GH suppliers, Griffin, Winandy Rough Bros. as a source. Lots of size and power options, also louvers to close when not in service. 3500 is alot of cfm, have you figured close for your heat drop needs. I used to be in the greenhouse biz and two 3500cfm fans took care of a 30X96 greenhouse with full solar gain, hard to see your needs that high, but heck, I'm in Maine.
Good Luck, Will