Turn the HRV / ERV off. Pull the filter from its slot, vacuum it, and wash it only if the media allows water. Reinstall it dry, flat, and facing the same direction.
A dirty HRV / ERV filter can choke airflow and leave the house feeling stuffy. The key checks are simple: media type, frame shape, airflow arrow, and full dry time.
Before you start: Turn the HRV / ERV off before opening the access panel. Match the old filter's size, thickness, frame style, airflow direction, and unit model before ordering a replacement.
Before washing or buying a filter, separate normal dust buildup from replacement signs or a ventilation problem elsewhere.
This page fits when: The filter is dusty or lightly clogged. The frame is still square, and the media is reusable foam or plastic mesh.
Check something else when: Weak airflow after cleaning points past the filter. Check the core, outdoor hoods, ducting, blower, and controls.
This page fits when: Replace torn, badly warped, moldy, crumbling, or paper-like disposable media. Do not soak those filters.
Check something else when: Before ordering, match the old part number, dimensions, thickness, frame style, airflow arrow, and unit model.
This page fits when: The compartment is dry, the fan is off, the access door opens normally, and the filter slides out without force.
Check something else when: Stop if you see standing water, mold growth, damaged wiring, burned smells, a broken latch, or bent metal that traps the filter.
A useful filter photo shows the dirty face, frame edge, and track position. Use those details before washing, replacing, or reinstalling.
Use it for: Dusty reusable media that needs dry cleaning before any rinse. The brush lifts dust and lint without tearing the media.
Shop vacuums with brush attachment
Use it for: Helps loosen stuck dust from reusable filter surfaces and the filter slot.
Find a soft cleaning brush
Use it for: Useful if the filter is washable and needs more than dry cleaning.
Shop mild dish soap
Use it for: Wipes out the compartment and catches drips while the filter dries.
Find microfiber cleaning cloths
Use it for: Needed when the old filter is torn, misshapen, moldy, or not washable.
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If it works: You have confirmed the filter is dirty enough to clean and still in reusable condition.
If it doesn’t: A clean-looking filter points elsewhere. Check the core, ducting, outdoor hoods, or blower before repeating this task.
If it works: The filter is out and you know its original orientation.
If it doesn’t: If the filter stops partway out, look for a clip, tab, second panel, or bent frame holding it. Free that point before pulling harder.
If it works: Most loose dust and lint are removed from the filter and compartment.
If it doesn’t: If the filter still looks packed with grime after vacuuming, continue to a gentle wash only if the filter material appears reusable and washable.
If it works: The filter is clean without damage and free of soap residue.
If it doesn’t: If there is no washable label or the media does not clearly look reusable, replace the filter rather than risk ruining it.
If it works: The clean filter is back in place, dry, and seated flat.
If it doesn’t: A filter that will not sit flat is usually backward, warped, or outside the track. Remove it and compare the orientation again.
If it works: Airflow is improved, the unit sounds normal, and the filter stays in place during operation.
If it doesn’t: If airflow is still weak after cleaning, check the core, outdoor hoods, ducting, and blower for blockage or noise before you blame the cleaned filter.
Buy a filter only after you match the unit model, filter length, width, thickness, frame style, and airflow arrow.
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Check it every 1 to 3 months, especially during heavy heating or cooling seasons. If vents feel weak, dust gathers around the unit, or the home has pets, smoke, or renovation work, look at the filter sooner.
No. Some are reusable foam or mesh filters, while others are disposable. Paper-like media, delicate pleats, or separating seams are replacement signs.
A damp filter can restrict airflow, hold odors, and add moisture where it does not belong. Let it dry completely before reinstalling it.
The filter may not be the only restriction. Check the heat or energy recovery core, outdoor hoods, ducting, blower, and controls next.
Replace the filter if the media is torn, warped, moldy, disposable, or still badly stained after cleaning. Clean only a sound reusable filter that keeps its shape.
Repair Riot keeps this HRV / ERV filter cleaning guide focused on power-off access, washable-media limits, full drying, orientation, and model-matched replacement when cleaning is not the right fix.