Metal mesh grease filters should generally be cleaned about once a month with typical cooking habits, while charcoal filters (used in ductless range hoods) cannot be cleaned at all and need replacing roughly every 3–4 months. Heavy or frequent frying pushes the metal-filter interval down to as often as every 2–3 weeks, while light, occasional cooking can stretch it out to closer to every 2–3 months.
The baseline schedule
| Filter type | General cleaning/replacement interval |
|---|---|
| Metal mesh (most common, ducted hoods) | About once a month with typical cooking |
| Fabric filters | Replace (not clean) roughly every 3–4 months |
| Charcoal/carbon (ductless hoods) | Replace (not clean) roughly every 3–4 months |
Adjust based on how you actually cook
- Frequent frying or heavy grease cooking: clean metal filters every 2–3 weeks — grease-heavy cooking clogs a filter meaningfully faster than the general baseline.
- Moderate, everyday cooking: the standard monthly interval works well for most households.
- Light or occasional cooking: stretching to every 2–3 months is reasonable, though it is still worth a visual check periodically rather than waiting purely on a calendar.
How to clean a metal mesh filter
- Remove the filter from the hood
Most slide or unclip out easily without tools.
- Soak in hot water with dish soap
About 20 minutes is usually enough to loosen baked-on grease.
- Scrub with a soft brush
Work into the mesh openings specifically, where grease tends to concentrate.
- Alternative: run it through the dishwasher
The hottest cycle available works well for a deeper clean on most metal filters — check your specific filter’s care instructions first.
- Dry completely before reinstalling
A damp filter can drip and attract dust immediately after going back in.
Charcoal filters: replace, don’t clean
Charcoal (carbon) filters found in ductless range hoods work by absorbing odors rather than just trapping grease, and that absorptive capacity cannot be restored by washing. Attempting to clean and reuse one is not effective — replace it on the recommended interval instead, adjusting more frequently with heavier cooking use just like the metal-filter schedule above.
Signs it needs attention sooner than scheduled
A general schedule is a starting point, not a hard rule. If a filter looks visibly saturated with grease, or you notice the hood pulling air noticeably less effectively than usual, clean or replace it immediately rather than waiting for the next scheduled interval — see our range hood not venting guide if airflow has already become a real problem.
Why staying on schedule actually matters
Beyond simple airflow performance, a heavily grease-caked filter is a genuine fire risk sitting directly above your cooking surface — grease buildup is combustible and concentrated exactly where heat and open flame are most likely. Regular cleaning is a safety habit as much as a maintenance one, not purely about keeping the hood working efficiently.
