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 7½ minutes. To determine the fan’s minimum cfm, divide your bathroom’s volume by 7.5. Go with a higher cfm if the duct run exceeds 20 feet or has more than one elbow.
How can I make my bathroom fan work better?
Options for Fixing Bathroom Ventilation Problems
- Install a recirculating fan in a half-bath. This type of bath fan doesn’t exhaust air to the exterior. …
- Reduce noise with an inline fan. …
- Vent under the floor to get outside. …
- Build a soffit to hide ductwork. …
- Install commercial ductwork.
How long should a bathroom fan stay on after a shower?
about 20 minutes
Well, depending on the size of your bathroom, the time may vary a little, but the general consensus is that leaving the fan running for about 20 minutes after a shower is long enough to remove the moisture from your bathroom.
