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Old 10-31-2014, 09:21 PM   #1
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Bathroom exhaust fan problem:


A few months ago I had The World's Worst Contractor add a bedroom/bathroom addition on our one-story ranch house. I don't want him back here, EVER, so I'm trying to fix problems myself.

(Let's just skip the discussion about suing him, etc., just not worth it.)

There's a rather expensive round Broan exhaust fan/heater/light in the bathroom. When the heater is not in use, cold air pours down through the vents into the bathroom.

What can I do to fix it? TIA.
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Old 10-31-2014, 09:40 PM   #2
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Where does it exhaust to?
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Old 10-31-2014, 10:23 PM   #3
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It sounds like the flap is missing that is supposed to prevent air from blowing back through when the fan is off.
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Old 11-01-2014, 08:43 AM   #4
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Follow-up question:


HDS & Jim- Thanks for your prompt replies.

HDS, I'm not sure about that. Knowing this contractor, it probably vents to NOWHERE!

If this is true, and Jim's idea is correct about the flap, what can I do????

TIA

-Gary
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Old 11-01-2014, 10:35 AM   #5
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You need to trace the vent duct from the source (the fan) to the point where it exits the house. If it does not exit the house, i.e. it exhausts into the attic, you need to replace the exhaust piping and carry the outlet to the outside, which may require cutting a hole in the siding or the soffit. Impossible to say without details of your installation. But it all starts with you tracing the exhaust duct. There are usually flaps that prevent cold air from backing into your fan housing, maybe the system was installed without one, in which case you need to add it, and possibly reroute the duct as well.
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Old 11-02-2014, 11:49 AM   #6
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You will see the flap once you remove the light assembly and bent cover. It should be in plain sight between the fan and exhaust where it connects to the duct if there is one. In any case, taking the vent apart might answer some questions as to why it is not keeping cold air out.
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Old 11-02-2014, 04:32 PM   #7
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Fantech and others sell in-line dampers than can be added, further up along the ducting. Might be useful if yours can't be made to work properly.

I have to add them to ours to cut down on wind gusts causing the dampers on the grilles to flap.
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