Cleaning Bathroom Exhaust Fans
Bathroom exhaust fans are among the most neglected cleaning targets in Ontario homes — and among the most impactful. A clogged exhaust fan fails at its primary job (removing moisture-laden air), contributing to bathroom mould, and the dust buildup inside the housing can become a fire hazard if the motor overheats. Annual cleaning is the minimum.
How to Clean
Turn off the circuit breaker for the bathroom before touching the fan — not just the light switch. Remove the fan cover (usually held by clips or a single screw) and wash it in warm soapy water. Use a vacuum with a brush attachment to remove dust from the fan blades and motor housing. A cotton swab dipped in rubbing alcohol cleans the blades and housing edges where a vacuum can't reach. Allow everything to dry completely before reassembling and restoring power.
Signs Your Fan Needs Cleaning
- Visible dust or lint hanging from the grille
- Fan sounds louder or more strained than normal — dust increases motor load
- Mirror stays foggy longer than usual after a shower — reduced airflow from buildup
- More bathroom condensation than previous seasons
Frequency
Annual cleaning as a minimum. In households with pets (pet hair enters HVAC and exhaust systems significantly faster) or in dusty environments, every 6 months.