DIYbanter - View Single Post - Installing a bathroom exhaust fan and the proper way to vent it...

wrote:
"What happens is that warm moist air is drawn into the next soffit
vent

into the attic space where it can cause damage. Remember that soffit
vents
are normally air inlets. "

I guess that's theoretically possible, but has anyone ever seen it
lead to an actual problem? Bathroom fans are almost always on for a
short time, so any moisture that was introduced should dissipate
pretty quickly. I have a hard time believing that in actual
practice, this is really an issue. It's done on most of the homes
here in NJ that I've seen and hasn't been harmful.

The point is why do it that way when there are better ways?

I don't know if there are documented problems when it is properly vented
out the soffit, but it is common that someone will just put the vent close
to a soffit vent and consider that proper venting. That has been reported
as causing problems.

I have heard of a couple of cases where someone reported that even when
properly venting out through the soffit there has been problems, but I am
slightly skeptical of those so I would not say it has been documented. .

--
Joseph Meehan

Dia duit