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sir1900 01-18-2013 12:11 AM

Bathroom fan not drawing air properly
I have a general question about a bathroom fan not drawing air properly at a friend's house.

The house is a 1600 sq.ft two-storey built in 2003. There are 3 bathrooms: 1 on the main floor, 1 on the second level off the hallway, and 1 on the second level off the master bedroom.

The issue is with the bathroom off the master bedroom. The fan does not draw any air unless I close the vent on the main floor bathroom and turn off the fan. This is the only time it works.

The bathroom off the hallway works at all times. No issues there.

A plumbing & heating company was contacted and they said because the fan will draw from the first source you have to reduce the damper on main floor washroom so that it doesn't steal all the air. I have never heard of this before. In my own house, I can have all the bathroom fans running simultaneously and it would work just fine.

Is what I am being told a logical response, or is there something I should be looking into? I think they are tied to the same exhaust as it appears there is a main fan located in the basement.

Thank you in advance.

joecaption 01-18-2013 10:25 AM

Is there a gap of about 1" under the door?
Never head of a fan being located in a basement to exhost air in the bathrooms above it.

There are systems that are made to have one central fan to exhost more then one room with the same fan, but if someone just used a tee with no baffles it's not going to work.

jagans 01-18-2013 11:13 AM

This just sound dumb. Each fan should have its own piping to outside. Why have they complicated something so simple? You mean to tell me that they design something where if the one fan goes down you lose all your bathroom venting? Brilliant. Also like Joe said, no intake, no exhaust.


joecaption 01-18-2013 11:21 AM

Panisonic is one company that makes a central vent system.

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