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<blockquote data-quote="SlugSlinger" data-source="post: 3720194" data-attributes="member: 7248">We had a similar problem in one of our bathrooms.&nbsp; When I would do my business in this bathroom, I would feel a cold breeze coming from the vent side of the vent/heater/light fixture. I did a little research on how the ductwork should be plumb and found that I could add a valve to the duct, simile to this:This is upside down as it should be installed.[ATTACH=full]250377[/ATTACH]&nbsp;I decided to investigate and it was tough because I couldn’t easily access the area above this bathroom.&nbsp; So I decided to remove the fixture and go that direction.&nbsp; When I did, I found that a one way valve was attached to the vent outlet on the fan.&nbsp; However, some jackwagon installed it upside down where it would remain open all the time.&nbsp; I turned it over and reinstalled the fixture, and no more draft.&nbsp; The way that valve works is gravity will keep it closed because the disc is offset, but when the fan starts, the valve opens.</blockquote>

[QUOTE="SlugSlinger, post: 3720194, member: 7248"] We had a similar problem in one of our bathrooms. When I would do my business in this bathroom, I would feel a cold breeze coming from the vent side of the vent/heater/light fixture. I did a little research on how the ductwork should be plumb and found that I could add a valve to the duct, simile to this: This is upside down as it should be installed. [ATTACH=full]250377[/ATTACH] I decided to investigate and it was tough because I couldn’t easily access the area above this bathroom. So I decided to remove the fixture and go that direction. When I did, I found that a one way valve was attached to the vent outlet on the fan. However, some jackwagon installed it upside down where it would remain open all the time. I turned it over and reinstalled the fixture, and no more draft. The way that valve works is gravity will keep it closed because the disc is offset, but when the fan starts, the valve opens. [/QUOTE]

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