Your bath fan is designed to remove moisture from your bathroom. Run the fan while showering or bathing and until the mirror clears to remove about 75% of the moisture in the room. Run the fan for 15 minutes after the mirror clears to remove 50% of the moisture in the room. As we should try to keep the humidity in our homes at 50% or less, running the fan for 15 minutes after the mirror clears is a good idea.
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