Exhaust fan not pulling steam out

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In the Seattle area with old uninsulated or underinsulated houses, it's very common to see moisture build up on the walls and ceiling. It's simply caused by colder walls and ceiling along with warm moist room air. No matter how much airflow we can get moving through the bathroom, it's not fully fixed until they insulate.

Rob

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We have a fan of about the same CFM's. It never has pulled out all the steam and kept the walls dry. Really not so sure I'd want it to...
During the winter or summer that's pulling a lot of heat or cooling out of the room.
We just take our shower and get out and dry and leave the fan running with the door shut.
15 minutes later all the walls are dry and the mirror is clear. I really don't think you have a problem.
 
Installed the can/fan over the shower this morning, and it seems to be working pretty well. The air is pulling hard underneath the door. I’m going to add a countdown timer switch so she can leave it running for awhile also.

I ran the shower for about 10 minutes and there was very little steam left. In hindsight, I wish I’d just left the 50cfm fan in place and added the 110cfm fan at the top of the shower. But at least the ceiling isn’t cluttered with two fan grilles and two lights in such a small space.


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