Is it normal to have some air coming in from the fan into the
bathroom. I have a screen at the end of the exhaust pipe and there is
a flapper damper at the fan itself, factory installed. I cant really
use a sophet vent because it restricts the air flow and causes a
whistling sound when running. There was still air coming in that way
too, but not as much. Had to be windier. Thanks!
I believe you will find that most fans do have some back draft. The
good ones have less. The installation and the air pressure inside the home
will also make a difference. Your home needs some air exchange. For
example when your fan is on, air has to be coming in from somewhere to
On Oct 11, 12:43 am, firstname.lastname@example.org wrote:
It's not unusual, unfortunately. A couple of reasons. The spring
loaded damper at the outlet is a cheap piece and loses its seal. The
vent pipe is also a thermal short circuit to the outside air. They're
usually run through unheated spaces and consequently the air inside
loses its heat and the cold air looks for a lower spot to go lie
down. Namely, your bathroom.
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