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Posted by ftwhd on October 19, 2007, 3:52 pm
>bigjcw1023@gmail.com wrote in news:1192674978.836047.16270
>@k35g2000prh.googlegroups.com:
>
>> I have a Panasonic bathroom fan, about 75 CFM. I want to put a
>> backdraft damper at the end of the exhaust pipe to reduce cold air
>> coming in the bathroom. It is one of those spring loaded jobs and
>> says only needs .04 in W.G. pressure to open. I was going to put at
>> the end of pipe to the sophet for ease of installation, rather than
>> inline. Comments, or suggestions? I was also considering a eave vent
>> with dampers by deflecto white plastic, dual side dampers flush mount
>> to sophet. Anyone use one?
>>
>>
>
>I installed a trap similar to an pside down plumbing trap to prevent cold
>air backflow. The tap went up to hold warm air which prevented cold air
>from entering. Worked like a charm for 20 years. The trap has to contain
>warmer air than the outside air temp so it has to be insulated and in the
>attic as close as possible to the warm air source (bathroom). Sloped the
>vent pipe towards the outside so condensation would drain outside but never
>saw any stains on the outside of the house or other evidence of moisture.
>This is in Winnipeg where winter temps average well below freezing for 6
>months.
Thats a damn good idea.
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