We renovated a bathroom about a year ago, and have noticed that when the kids shower the room gets very foggy. (mirrors fogged, dripping on walls etc). I have seen lots of bathrooms with foggy mirrors etc but never dripping down the walls.
The room is approx 6'x9' with 9' ceilings. The tub is all open to above with only a curtain rod.
Originally I had a 110 CFM fan running through a 4" duct, and it was fogging up. (got so bad that water actually dripped from the fan)
Swapped to a 6" duct, no change.
Swapped fan from 110cfm to a 150CFM fan and its better, but honestly not perfect. Still lots of moisture on walls etc.
There is no problem with duct. (replaced). Its about a 15-20' run straight outside.
Everything I read online says that 150cfm should be well above what this size bathroom requires.
What I am wondering is if there is too much airflow into the room (AC) which is cooling the walls too much causing condensation when the hot shower runs.
Just doesnt add up to me. I have other bathrooms with 90cfm fans that have no issues other than the mirror fogs up for a short period.
The only other thing I can think of to fix this is the shower needs an enclosure to keep all the hot air inside the doors rather than into the room.
The room is approx 6'x9' with 9' ceilings. The tub is all open to above with only a curtain rod.
Originally I had a 110 CFM fan running through a 4" duct, and it was fogging up. (got so bad that water actually dripped from the fan)
Swapped to a 6" duct, no change.
Swapped fan from 110cfm to a 150CFM fan and its better, but honestly not perfect. Still lots of moisture on walls etc.
There is no problem with duct. (replaced). Its about a 15-20' run straight outside.
Everything I read online says that 150cfm should be well above what this size bathroom requires.
What I am wondering is if there is too much airflow into the room (AC) which is cooling the walls too much causing condensation when the hot shower runs.
Just doesnt add up to me. I have other bathrooms with 90cfm fans that have no issues other than the mirror fogs up for a short period.
The only other thing I can think of to fix this is the shower needs an enclosure to keep all the hot air inside the doors rather than into the room.