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Old 05-13-2013, 08:09 PM   #1
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6" duct for the exhaust fan


Hi,

I am installing an exhaust fan in my master bathroom and I need a 6" duct to the roof.

I read that in terms of air flaw a rigid galvanized duct is better, but on the other hand, condensation suggests and insulated duct.

How about a rigid galvanized duct with covered with an insulated sleeve?
Wouldn't I get the best results on both?

My idea is to run 2ft straight duct from the fan, then an elbow and then another 2ft to the roof.

I am having big difficulties to find 6" ducts as well as a roof cap, I did not expect it, it seems most of the people is using 4" .

Roof cap: I can only find this type online which is very expensive and I am not sure it is suitable to snow climates like the one I live, too low.
Are there better alternatives?

Thank you!
Alex


Last edited by Metallo; 05-13-2013 at 09:06 PM.
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Old 05-14-2013, 12:07 AM   #2
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6" duct for the exhaust fan


thats a very common one around here and id say it snows here a bit (up until 2 weeks ago) that is a high price for it, try going to your local HVAC supply house and you may be able to get one at a cheaper price.

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Old 05-14-2013, 06:13 AM   #3
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6" duct for the exhaust fan


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Originally Posted by HVAC1000 View Post
thats a very common one around here and id say it snows here a bit (up until 2 weeks ago) that is a high price for it, try going to your local HVAC supply house and you may be able to get one at a cheaper price.
Thanks for the tip.
What about the idea to combine galvanized duct with an insulated sleeve?
Also, does the duct gauge play any important role?

Thanks
Alex
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Old 05-15-2013, 12:06 AM   #4
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6" duct for the exhaust fan


Quote:
Originally Posted by Metallo

Thanks for the tip.
What about the idea to combine galvanized duct with an insulated sleeve?
Also, does the duct gauge play any important role?

Thanks
Alex
The gauge of metal shouldn't make a big difference it will be more about rigidity. For example flue pipes I have to use 26 ga or lower because they will likely rust or corrode, however for duct work I usually use 30 ga because its cheaper and easier for a guy to handle, cut, and lift. If I were doing what you are I would probably use 26 ga but that's also cause I have scraps that size in the back of my shop, whatever you use should work though.

As for insulating sleeve, that is a good idea considering you are passing through an unconditioned space with your pipe, and will reduce the amount of condensation in the pipe.
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