Q: Our bath fan doesn't keep moisture off the walls, even if we open a window. Do we need a bigger fan?
Bill Jackson, Olyphant, Pa.
Matt Tomis of Tomis Electrical Contractors replies: You shouldn't have to open a window! Maybe the fan is clogged with dust. Take off its cover and vacuum out its housing. And, if you can get to the fan's duct, make sure it isn't pinched or blocked. If that doesn't help, it's probably time for a new fan.
You want one with a cubic-feet-per-minute (cfm) rating that's high enough to pull all the air out of your bathroom in 7 minutes. To determine the fan's minimum cfm, divide
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