Turn it on for the shower, leave it on after
I run the bathroom fan for the whole shower, then leave it on another 15 to 20 minutes after the water stops. That extra time clears the humidity that is still hanging in the air and in the towels. Opening a window helps when weather allows, but the fan is the everyday habit.
The EPA's mold guidance is clear: run the bathroom fan or open a window when showering, and keep indoor humidity under control so mold does not get a foothold. A fan that vents into an attic instead of outdoors just moves the moisture problem into the roof space. The air needs to leave the house.
If the mirror is still fogged 20 minutes after the shower with the fan on, the fan is weak, dirty or not venting outside. That is worth fixing before winter humidity stacks up.
Source: U.S. EPA — A Brief Guide to Mold, Moisture and Your Home
The tissue test takes five seconds
With the fan running, hold a single tissue up to the grille. It should pull toward the fan and stick. If the tissue barely moves, or falls, the fan is not moving enough air. Dust on the grille, a loose duct, a disconnected vent or a worn motor are the usual reasons.
Wipe the grille when dust builds up. Do not stick tools deep into a running fan. Power the fan off at the wall switch before any cleaning near the blades. A wobbly grille, sparks or a fan that only works sometimes means stop and call a qualified electrician — bathroom fan wiring is not a DIY panel job.
Test every bathroom fan once a season with the tissue trick. Guest baths get skipped the most and often fail first.
Source: U.S. EPA — Remodeling Your Home and Indoor Air Quality
Hum, no airflow or a hot smell means turn it off
A fan that hums but moves no air, gets hot to the touch, smells like burning or trips a breaker is a stop sign. Turn it off at the switch and leave it off. Replacing a bathroom exhaust fan — especially one wired into a ceiling box or tied into a light — is work for a qualified electrician. Never open an electrical panel to chase a dead fan circuit.
Same rule if the fan sparks, the switch feels warm or moisture is staining the ceiling around the fan. Moisture plus bad wiring is not a weekend experiment.
Fan humming with no pull, a hot smell or mold that keeps coming back in the bath? Call me at (470) 999-7395. A $79 diagnostic is how I sort out whether it is airflow, venting or an electrical problem that needs a qualified electrician.
