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Old 11-10-2011, 05:08 AM   #1
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Bathroom fan damper missing is roof vent damper enough??


i had an energy audit done and notice one of my bathroom fans spinning backwards when they had the negative air pressure on.

I took apart all my fans and none have the damper directly behind the fan (as do the ones that u brand new) I guess the fan that was spinning has a damaged roof damper. I assume the house has roof vent dampers on all the exhaust fans it is 13 years old.

So my question is the roof damper enough or should i have a damper directly behind the fan also..
http://www.centralvacuumstores.com/B...-Connector.php

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Old 11-10-2011, 06:35 AM   #2
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Bathroom fan damper missing is roof vent damper enough??


The auditer should give you a complete report on your house, the fan should be included in that report. If your fan was going backwards when they did the blower door test then you have leakage there and should replace the fan and seal it. You can ask them on the CFM size you need for the size of the bathroom. I can give you more info. if you have the report.

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Old 11-10-2011, 03:04 PM   #3
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Bathroom fan damper missing is roof vent damper enough??


none of my fans have the plastic dampers behind it and only 1 was spinning.
He didnt confirm what the problem was but i guess i should look if the connection behind the fan is not proper or i guess the roof damper is bad?
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Old 11-10-2011, 03:38 PM   #4
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Bathroom fan damper missing is roof vent damper enough??


Dampers are something that was never put in the past, for baths. Just go to the local hardware store and get a inline if able to access the duct up in the attic. If can not access duct, install a new outside vent. Only way to find out if it vents to the roof, is by looking up there, or getting in the attic and following the ductwork.
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Old 11-10-2011, 03:44 PM   #5
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Bathroom fan damper missing is roof vent damper enough??


I check 2 box stores and they don't sell the fan dampers
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Old 11-10-2011, 04:29 PM   #6
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Bathroom fan damper missing is roof vent damper enough??


You will never find them under that name. They are called "inline duct damper's", also called "Backdraft damper". You will find them where the dryer stuff is in Lowe's, or where the ductwork is.

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