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Bathroom vent not working properly
Posted on 2/17/21 at 9:41 am
Posted on 2/17/21 at 9:41 am
Vent in my guest bath is not working properly causing condensation on the walls. The fan is working and if I put a piece of toilet paper an inch beneath it is sucks it up to the screen but is not pulling enough to remove steam from the air. Any tips on remedying this? I assume the duct in the attic is clogged?
9
Posted on 2/17/21 at 9:47 am to mouton
If its pulling the toilet paper up, the duct is not clogged.
You're likely dumping more steam in the room that it can immediately suck up. Run the vent after the shower too.
Do you have a huge/high flow shower head? That could be part of the problem.
You're likely dumping more steam in the room that it can immediately suck up. Run the vent after the shower too.
Do you have a huge/high flow shower head? That could be part of the problem.
Posted on 2/17/21 at 9:48 am to mouton
Yes check duct and fan blades for lint buildup or you could replace with a more powerful unit.
Posted on 2/17/21 at 9:56 am to mouton
Unit is likely just not drawing sufficiently. Get a bigger one. Too many underpowered BR vent fans are installed, esp if your BR is of the larger modern square footage style. I had moisture issues and replaced all of mine with increased CFM models; it made a big difference.
Posted on 2/17/21 at 10:20 am to mouton
Check the ducting. If it’s fine, your fan is probably undersized
Posted on 2/17/21 at 10:37 am to jimbeam
Can just the fan and motor be upgraded or must the entire unit be changed out?
Posted on 2/17/21 at 11:01 am to mouton
There are online calculators (based on number of water fixtures, sq ft, ceiling height) that will determine the necessary CFM of bathroom exhaust fan. You may even need to upgrade to a larger duct diameter and roof vent. Previous posters are correct--contractors put in way undersized fans ("fart fans") in modern bathrooms.
Posted on 2/17/21 at 12:16 pm to CORIMA
It’s possible that a new fan could fit in the existing house though the way they snap in might not work. It’s not much work to install a completely new unit.
Posted on 2/17/21 at 12:37 pm to mouton
Mine started doing this too. I wonder if the exhaust shutter has frozen shut due to moist air condensation and freezing.
Posted on 2/17/21 at 1:00 pm to Dandaman
quote:
I wonder if the exhaust shutter has frozen shut due to moist air condensation and freezing.
That's my first thought as well.
Posted on 2/17/21 at 1:07 pm to SurfOrYak
This is a very small powder room type bath.
Posted on 2/17/21 at 1:23 pm to mouton
Let me know what you find!
Posted on 2/17/21 at 2:02 pm to mouton
So its a small bathroom with a shower. That's part of the problem.
I asked before what type of showerhead is in there. One with lower volume could help.
I asked before what type of showerhead is in there. One with lower volume could help.
Posted on 2/17/21 at 3:15 pm to mouton
My son bought an older condo and had the same problem. I went in the attic and there wasn't even a vent hose hooked up to the fan and cellulose insulation was poured over the outlet end. 
Works great now after adding a vent hose.
Works great now after adding a vent hose.
Posted on 2/17/21 at 7:43 pm to mouton
In the meantime run a small fan in the bathroom. If the air in a bathroom is stirred up, more of the steam will get sucked out by the vent.
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