Pull the filter and run it under hot water. That fixes most range hood complaints. This covers what to do when it doesn’t, because grease in a filter and grease in a blower wheel are two different problems with two different fixes.
Know which filter you’ve got
Sort this before you clean anything. Residential hoods run one of two types.
Mesh filters are the aluminum layers that look like stacked window screen. Cheap to replace, easy to wash, and a homeowner can handle them start to finish.
Baffle filters are heavier stamped-metal panels with angled channels, common on the pricier hoods from Broan, Zephyr, and the higher GE and KitchenAid lines. Grease runs down the baffles into a trough instead of getting trapped in mesh. More efficient, easier to clean, but that trough fills up and needs regular attention.
Washing mesh filters
Pull them, soak 15 to 20 minutes in hot water with dish soap or a degreaser, then scrub with a soft brush. A dishwasher works if the filters are dishwasher-safe (check the manual or the stamp on the frame). Dry them fully before they go back in.
If a mesh filter’s brown or black clear through and the metal looks corroded or flaky, replace it instead of cleaning. A filter that’s past cleaning chokes airflow and makes everything worse. Generic replacements run $10 to $20; OEM filters for name brands cost more. Check your hood’s model number before ordering.
Washing baffle filters
Same hot soak. The difference is the trough: empty it first. Wipe it out with paper towels before the filter hits the sink, or you’re just relocating the grease.
For baked-on grease, a paste of baking soda and dish soap left 30 minutes lifts it without scratching the metal. Rinse well. These usually take a dishwasher fine, but check your documentation first.
How often
Cook daily? Mesh every 3 to 4 weeks, baffle every 4 to 6. Lots of high-heat cooking, stir-fry, searing, frying, cut those in half.
A quick tell: wipe the underside of the hood near the filter housing. Thick grease on the towel means you’re overdue.
When clean filters don’t fix it
Here’s what I see on calls that started as “I just need the filter cleaned.”
Still weak after clean filters. Grease slips past the filter over time and coats the blower wheel, the fan that actually moves the air. A caked wheel loses real efficiency, and you can’t reach it from outside the hood. The motor housing has to come apart, and reassembly means knowing how the harness reconnects and whether your hood has a thermal fuse to test first. Not a DIY job for most people.
Motor runs but grinds or rattles. Usually a worn bearing, an unbalanced wheel from uneven grease, or debris in the cage. Sometimes just a clip that vibrated loose. Running it like that shortens the motor’s life, so have it looked at soon.
Noise but almost no air. Check the damper first. It’s a flap in the duct that opens when the hood runs and closes when it doesn’t. Grease makes it sticky and it partly jams. You can often reach it from above the hood or at the exterior vent cap, clean it with degreaser, and make sure it swings free. Stuck open, you bleed heat in winter. Stuck closed, the hood does nothing.
Motor runs on and off, or not at all. Most hood motors have a thermal overload switch that cuts power when the motor overheats, which happens when clogged filters choke airflow. Clean filters and it still won’t run steady, the switch may be gone or the motor’s failing. Loose wiring and a bad control switch are common too, depending on the hood.
When to call
Cleaning filters is genuinely a DIY job, and you should do it. But if you’ve cleaned them and performance didn’t come back, or the hood’s making sounds it never used to, the problem’s moved past the filter.
At that point it’s usually the blower assembly, the motor, the damper, or the control board. Some of those are quick repairs; some need parts that take a few days to land. Bay Area Appliance Repair Service handles range hoods across the Bay Area as part of our regular appliance work. Not sure whether it’s a filter issue or something deeper? Schedule a visit and the $75 diagnostic will tell you, credited to the repair.