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Old 10-09-2012, 06:03 PM   #47
Dave in Wi
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Joined: Feb 2007
Location: Madison WI (40 Square Miles Surrounded By Reality)
Oddometer: 2,051
Originally Posted by Commuter Boy View Post
Don't cheap out on the duct size, moving up to 5" or 6" will let you put in a much quieter model and still move the same amount of air.
That is where I might jimmy-rig mine. The existing exhaust wall cap and fan has a 3 inch corrugated duct. If I go to 4 inch (which my new fan has) I need to replace the wall cap, and its in a right bitch of a spot for me to get to. I did buy a new wall cap tonight, I need to borrow an extension ladder and see if I can even reach the cap. If I can't reach it I'll transition from 4 to 3 inch inside the attic. The fan probably won't be able to hit its rated cfm but it might be the best I can do.
Dave in WI
2002 ZRX1200R
1975 XL100
1988 DT50
"Daddy, it's five o'clock sometime!"
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