Question about Broan-NuTone N-QT140L Combination Light Fan Exhaust Fan

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We had specified a Nu-Tone QT-140L bathroom fan when we built and over time we didn't think that the fan was exhausting the bath correctly, but did nothing. Over time we saw moisture damage in the cieling. After investigating, I found out that the builder used 4 inch non-insulated flexable ducting which was vented to the house side wall about 10 feet away. I looked at the installation procedure and they spell out using 3 1/4 x 10 inch duct. This pipe reduction along with a leak in the flex duct I feel was the cause for my problems. My question is should I run the 3 1/4 x 10" duct or can I use 6 inch duct. It's a straight run with no elbows and I would have to change the outside vent cap. I guess that I can purchase a 3 1/4 x 10 vinyl vent cap or do I need to adapt to a 6 inch vinyl vent cap if I used 3 1/4 x 10' duct? I want to make sure that I have 150 CFM air flow. Thank you Dave Barclay

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SOURCE: NuTone QT80 is not clearing moisture/condensation

This should not be a problem. If you think you need a more powerful fan a there is a 110 CFM replacement fan that will fit in the same housing. The NuTone part# is 0696B000. There are some generic versions out there on ebay and amazon that have been causing people a lot of trouble. I would recommend buying from an Authorized NuTone dealer only.

Posted on Nov 19, 2010

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