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Old 10-11-2012, 01:54 PM   #1
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4 inch duct instead of 6 inch


I am installing a new vent in a basement bathroom where the ductwork would be a total of 7 feet away from the trunk (including 2 90 degree turns) can I use a 4 inch duct instead of a 6 inch? The space is really tight and a 6 inch and an oval will not work.

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Old 10-11-2012, 02:48 PM   #2
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4 inch duct instead of 6 inch


How big is the bathroom??
You get about 100 cfm's from a 6" duct and about 30 cfm's from a 4" duct.Maybe the best choice is a 5" duct.

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Old 10-11-2012, 03:16 PM   #3
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4 inch duct instead of 6 inch


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Originally Posted by buildit45 View Post
I am installing a new vent in a basement bathroom where the ductwork would be a total of 7 feet away from the trunk (including 2 90 degree turns) can I use a 4 inch duct instead of a 6 inch? The space is really tight and a 6 inch and an oval will not work.
agree with rep ...size...but most of the time 4" can provide enough for bathroom to keep the chill off..ben sr
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