Pull out the filter and run it under hot water. That handles most range hood problems. The rest of this guide covers what to do when it doesn’t, because grease in a filter is not the same problem as grease in a blower wheel, and the fix is very different.
What kind of filter do you have?
Before you clean anything, know what you’re working with. Most residential hoods use one of two types.
Mesh filters are the aluminum layers that look like window screen stacked a few times. They’re cheap to replace, easy to wash, and most homeowners can handle them start to finish.
Baffle filters are the heavier stamped-metal panels with angled channels, usually found on higher-end hoods (Wolf Pro series and some other Wolf lines, Zephyr, Broan’s upper lines — though Wolf uses both mesh and baffle filters depending on the model). Grease runs down the baffles into a collection trough instead of getting trapped in mesh. They’re more efficient and easier to clean, but that trough needs regular attention because it fills up.
Cleaning mesh filters
Remove them, soak in hot water with dish soap or a degreaser like Simple Green for 15-20 minutes, then scrub with a soft brush. A dishwasher works if your filters are dishwasher-safe (check the manual or look for a symbol stamped into the frame). Dry completely before reinstalling.
If your mesh filter is brown or black all the way through and the metal looks corroded or flaky, replace it rather than cleaning it. A clogged-beyond-cleaning filter restricts airflow and makes everything worse. Prices vary by brand; generic replacements can run $10-20, while OEM filters for name brands often cost more. Check your hood’s model number before ordering.
Cleaning baffle filters
Baffle filters get the same hot soak treatment. The difference is that grease trough: empty it first. Use paper towels to wipe it out before you drop the filter in the sink, or you’re just moving grease from one place to another.
For stubborn baked-on grease, a paste of baking soda and dish soap left for 30 minutes does the job without scratching the metal. Rinse thoroughly. These filters typically handle dishwashers well, but again, check your documentation first.
How often?
If you cook daily, mesh filters need a wash every 3-4 weeks. Baffle filters, every 4-6 weeks. If you do a lot of high-heat cooking (stir-fry, searing, frying), cut those intervals in half.
A visible cue: if you wipe the underside of your hood near the filter housing and get a thick coat of grease on a paper towel, you’re overdue.
When cleaning the filter doesn’t fix the problem
Here’s what I see on service calls that started as “I just need the filter cleaned.”
Airflow is still weak after clean filters. Grease travels past the filter over time and coats the blower wheel, which is the fan that actually moves air. A grease-caked blower wheel can lose significant efficiency, and you can’t clean it from outside the hood. The motor housing has to come apart. This is not a DIY job for most people because reassembly requires knowing how the wiring harness reconnects and whether your hood has a thermal fuse that needs testing before you button it up.
The motor runs but you hear a grinding or rattling noise. This is usually a worn motor bearing, an unbalanced blower wheel from uneven grease buildup, or a piece of debris in the blower cage. Sometimes it’s just a small metal clip that vibrated loose. Either way, running the motor in this condition shortens its life. Worth having someone look at it soon rather than waiting.
The hood makes noise but pulls almost no air. Check the damper first. It’s a flap in the duct that should open when the hood runs and close when it doesn’t, so outside air doesn’t come back in. They get sticky with grease and partially stuck. You can often reach this from above the hood or from the exterior vent cap. If it’s accessible, clean it with degreaser and make sure it opens freely. Stuck open permanently, you lose energy in winter. Stuck closed, your hood is basically useless.
The motor runs intermittently or not at all. There’s a thermal overload switch in most hood motors that cuts power when the motor overheats, which can happen from restricted airflow caused by dirty filters. If you clean the filters and the motor still won’t run consistently, the switch may have failed or the motor itself is going. Loose wiring connections and a failing control switch are also common causes, depending on the hood.
When to call someone
Filter cleaning is genuinely something you can do yourself, and you should. But if you’ve done it and the performance hasn’t improved, or if you’re hearing sounds the hood didn’t make before, those are signs the issue moved past the filter.
At that point it usually involves the blower assembly, the motor, the duct damper, or the control board. Some of those are straightforward repairs. Some require parts that take a few days to source.
I run a full-service appliance and HVAC repair company in the Tri-Valley and East Bay. Range hoods are part of our regular inventory. If you’re not sure whether what you’re describing is a filter issue or something deeper, the diagnostic visit will tell you. You can book at adriumservice.com.