Cleaning Bathroom Exhaust Fans
The bathroom exhaust fan is one of the most commonly neglected items in Ontario homes — and one of the most important for preventing mould. Its job is to exhaust humid air before it condenses on surfaces and feeds mould growth. A fan clogged with dust and lint moves dramatically less air, often making it nearly useless. Ontario's humid summers and dry heated winters both stress bathroom surfaces; a properly functioning exhaust fan is the primary defence against chronic moisture problems.
How Often to Clean
Every 3–6 months, or whenever you notice the fan is louder than usual (dust-clogged fans are less efficient and work harder), the grille looks grey with dust, or the bathroom stays steamy longer after showers.
The Method
- Turn off the circuit breaker for the bathroom at the panel — not just the fan switch. This is the critical safety step that most people skip
- Remove the grille: Most grilles pull straight down and have spring clips — squeeze the clips and it comes free. Some are screwed in
- Wash the grille: Warm soapy water, rinse, let dry completely
- Vacuum the housing: With the grille off, use a vacuum brush attachment to remove dust from the fan housing interior, the motor housing, and the blades
- Wipe remaining surfaces: A damp cloth removes remaining residue
- Let dry, reattach grille, restore power
Signs the Fan Needs Replacement
If after cleaning the fan is still noisy, extremely slow, or fails to clear steam within 10–15 minutes, the motor may be at end of life. Bathroom exhaust fan replacement is an inexpensive job — a new fan runs $30–$80 at Home Depot, and the swap typically takes under an hour for a handy homeowner.