How to Clean an Air Purifier — Toronto Home Guide

An air purifier that hasn't been cleaned in months is running at reduced efficiency at best, and in some cases can release captured particles back into the air when the filter is fully saturated. Cleaning an air purifier is straightforward, takes about 15 minutes, and should be done every month or two depending on how heavily the unit runs.

Identify Your Filter Type First

Different filter types have different cleaning rules — using the wrong method can damage the filter and reduce its effectiveness:

• True HEPA filters — cannot be washed. Washing a HEPA filter damages the fibres and destroys its effectiveness. The only maintenance is gentle vacuuming of the outer surface to remove larger particles. HEPA filters must be replaced, typically every 6–12 months.
• Activated carbon/charcoal filters — cannot be washed. Must be replaced per the manufacturer's schedule (typically every 3–6 months).
• Pre-filters — the washable foam or mesh layer in front of the HEPA in many models. This is the only part that can typically be rinsed with water. Check your manual to confirm.
• Washable/permanent filters — found in some models marketed as "washable." Can be rinsed under cool water and air dried.

When in doubt, check the manual or the manufacturer's website for your specific model. Never wash a component labelled non-washable.

Cleaning the Pre-Filter (Washable)

1. Remove the pre-filter per your model's instructions
2. Vacuum both sides with the brush attachment to remove loose dust and pet hair
3. If washable: rinse under cool water, squeeze gently to remove debris, rinse until water runs clear
4. Allow to dry completely (24 hours minimum) before reinstalling — never put a damp filter back in the unit

Vacuuming the HEPA Filter

1. Remove the HEPA filter
2. Hold it over a garbage bag or take it outside
3. Use a vacuum with a brush attachment on the lowest suction setting
4. Gently vacuum the pleated surface to remove surface dust — don't press hard or flex the filter
5. This extends filter life but does not fully restore it. Replace per schedule.

Cleaning the Air Purifier Housing

1. Unplug the unit
2. Wipe the exterior with a barely damp microfibre cloth
3. Use a dry brush or dry cloth to clean the air intake and outlet grilles — these accumulate dust buildup that restricts airflow
4. For models with air quality sensors: check if the sensor has a small opening or cover that can be gently cleaned with a cotton swab. Dust buildup on sensors causes inaccurate readings.

How Often to Clean and Replace Filters

• Pre-filter vacuum or rinse: every 2–4 weeks
• HEPA filter vacuum: every 1–2 months
• HEPA filter replacement: every 6–12 months (varies by model and usage)
• Carbon filter replacement: every 3–6 months
• Exterior wipe: monthly

Filter replacement schedules vary significantly by brand and usage level. Units running 24/7 in heavily used rooms or homes with pets need more frequent filter replacement than those running intermittently. Check the filter indicator light on your unit if it has one — it tracks runtime hours, not calendar time.

Maidless's regular cleaning covers the exterior of air purifiers as part of every clean. Book a Toronto house cleaning — HST included.