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Old 04-19-2009, 07:54 PM   #1
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Bathroom Exhaust Ducting Question


So I'm preparing to install a bathroom fan in a room thats never had one. The cheap fan I picked out has a 3" duct coming out of it. Because I have 6" insulted flexible ducting left over from another job, and I'd rather keep it big in case I have a change of heart down the road, what is the best way to go from 3" to 6"?

I found a couple reducers at the store, but the cost of the two I would need to pull this off is about $10 (almost as much as just buying a different size of ducting). Is there any alternative? I was thinking of maybe just clamping down real hard on the flexible duct until it meets, but I don't think that would hold very well in the long run...

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Old 04-19-2009, 09:31 PM   #2
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Bathroom Exhaust Ducting Question


Do yourself a favor and do it right to start with. Don't just rig stuff up to try and make it work to save a couple bucks.

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Old 04-20-2009, 05:59 AM   #3
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Bathroom Exhaust Ducting Question


The 3" duct tells me that the fan is undersized unless you bathroom is very small. In cold climates insualted duct is recommended because of condensation inside the duct, but rigid duct flows better. And where is that duct going to terminate?? Outside the attic I hope.
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