Reply to Bathroom Humidity - Solutions Needed

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[quote=Anonymous][quote=Anonymous][quote=Anonymous][quote=Anonymous]Something else is going on.

Let's say it's a big bathroom and it's 200 square feet. With eight foot ceilings that's 1600 cubic feet. A minimal exhaust fan will exhaust 100 cubic feet per minute, so in 16 minutes it will completely exchange the air in that room. Changing the air should get rid of all the humidity.

[b]My bet is the exhaust fan isn't actually working. It happens all the time that the exhaust gets blocked, the vent on the outside gets painted shut by painters or the hose gets pinched in the wall or something builds a nest in it. It also happens all the time that it was never hooked up properly to begin with. It can also happen that the fan blade breaks and even though the motor is turning it's not moving any air. If you light an incense stick under it it should easily suck all of the smoke out of the room.[/b]

The other possibility is there's another source of humidity other than the shower -- most likely a plumbing leak somewhere. But I'd check the fan first. [/quote]

DH and I checked on whether or not it was actually working. The exhaust butts up against an exterior wall, so we went to the back of the house where the exhaust [b]"exhausts" out, we could feel the air coming out. It felt quite surprising how much air was coming out, it felt like a fan[/b].

The bathroom is about 125-150 sqft. The window is inside the actual shower stall, as is the new exhaust fan. Just like in this image: 
[img]https://www.homeadvisor.com/r/wp-content/uploads/2016/08/3838496_original.jpg[/img]

[/quote]

110 CFM fan means almost 2 cubic ft of air per second. You should feel pretty strong blow out. And the air should feel very heavy w/ moisture. Is that how it felt? [/quote]

Typically a bath fan will have a 4" duct, which has a cross section of 12.5 inches. At 110 CFM the air has to move at 21 feet per second or about 14mph. That will feel like a stiff breeze. To get a feel, find a quiet street and drive that speed while holding your hand out the window. [/quote]

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