Exhaust fan & vent

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COGNOID
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Exhaust fan & vent

Post by COGNOID » Wed Sep 25, 2019 8:44 am

Hi Shannon,
I am going to install an exhaust fan in the bathroom but do not want to vent out the roof but will run the vent hose out the side of the house, question I have is there a limit to how long the vent hose should be (is 20 feet too long?).
Best Regards

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Shannon
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Re: Exhaust fan & vent

Post by Shannon » Wed Sep 25, 2019 10:23 am

20' is getting pretty long of a distance unless you have a really good sized quality fan. If its a straight run of smooth wall pipe and you have a good fan then you would be ok . If you have any turns in the duct then you will be pushing it IMO.
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christoff
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Re: Exhaust fan & vent

Post by christoff » Thu Sep 26, 2019 4:50 am

You could add a booster fan in the line to help the exhaust flow.

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Shannon
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Re: Exhaust fan & vent

Post by Shannon » Thu Sep 26, 2019 8:20 am

christoff wrote:
Thu Sep 26, 2019 4:50 am
You could add a booster fan in the line to help the exhaust flow.
Yes that would be an option if you find it is not pulling enough air on its own.
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COGNOID
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Re: Exhaust fan & vent

Post by COGNOID » Fri Sep 27, 2019 6:24 pm

Thanks everyone, I appreciate the feedback.

KevP
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Re: Exhaust fan & vent

Post by KevP » Tue Oct 15, 2019 4:53 pm

You might be better off with a larger inline fan if you have access above. Oversize the fan to compensate for the length.
I had to run my fan duct foe only 4 or 5 feet but had to put a slight bend close to it and used flex. My bathroom is 7x7 so 50 CFM is enough. I have a Panasonic with 80 or 110CFM option ans the 80 is more than enough

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