Key takeaways
- Ordering by appearance alone: Two filters can look similar but differ by a fraction of an inch. Match the model number and exact dimensions.
- Washing a charcoal filter: Charcoal cartridges are replacement items, not washable filters.
- Installing the filter backward: Follow the airflow arrow or the orientation of the original filter.
- Ignoring the metal grease filter: A clogged grease filter reduces airflow and can coat the charcoal filter with oil.
- Forcing clips or tabs: Stop if a retainer does not release easily. The part may need to slide before it lifts.
- Testing with loose parts: Never operate the hood while a filter, cover, or retaining clip is unsecured.
- Using a filter that blocks the blower: Excess thickness can create noise and strain the fan motor.
Replacing the charcoal filter in a ductless range hood is a small maintenance job with a noticeable effect on kitchen air. A saturated filter cannot trap cooking odors effectively, and an incorrectly installed filter may rattle, restrict airflow, or allow grease to collect inside the hood. In some models, using the wrong size can also leave gaps around the filter or prevent the fan cover from closing securely.
The process is usually straightforward and takes less than 30 minutes, but range hoods vary. Some use a charcoal filter that sits behind a washable metal grease filter; others use a combination filter with charcoal material bonded to a grease-trapping pad. Check your owner’s manual, the label inside the hood, or the old filter before ordering a replacement. The following guide applies to most ductless, or recirculating, range hoods as of 2026.
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What You Need
| Item | Why | Optional? |
|---|---|---|
| Correct replacement charcoal filter | Captures cooking odors before air is returned to the room. Confirm the dimensions, model number, shape, and mounting method. | No |
| Screwdriver | Some filter retainers, fan covers, or grease-filter clips use Phillips or flat-head screws. | Usually |
| Disposable gloves | Protects your hands from greasy residue and sharp metal edges. | Yes |
| Degreasing dish soap and warm water | Cleans the reusable metal grease filter and the accessible filter compartment. | Yes, but recommended |
| Soft cloth or paper towels | Wipes away grease without scratching painted or stainless-steel surfaces. | Yes |
| Measuring tape | Checks the old filter if its model number is missing or unreadable. | Yes |
Replacement prices commonly range from about $10 to $30 per filter or multipack, depending on size and brand. For example, an Air Filter Factory 8-3/4 x 10-1/2-inch combo filter for select Broan NuTone hoods is listed at $9.89, while a FIREGAS CC170 two-pack is listed at $25.99. Treat these as reference prices, not guarantees; compatibility matters more than the lowest cost.
Step-by-Step
1. Confirm that the hood is ductless (2–5 minutes)
Turn on the fan and look for air returning through vents on the front, top, or sides of the hood. A ductless hood recirculates filtered air into the kitchen rather than sending it outdoors through a vent pipe. Ducted hoods may have a grease filter but generally do not use a charcoal filter in the same way.
Check the manual or the model label, usually found behind the grease filter, inside the hood, or on the underside near the controls. Write down the model number before removing anything.
2. Switch off power and let the hood cool (3–5 minutes)
Turn off the fan and lights, then disconnect power if the hood has a plug. If it is hardwired, switch off the appropriate circuit breaker. Do not work near a hot cooktop or a running fan. Wait until the hood and nearby cookware are cool.
Put on gloves. Filters often contain sticky grease, and the edges of metal filter frames can be sharp.
3. Remove the metal grease filter (3–7 minutes)
Most metal grease filters release by pressing a spring-loaded latch, sliding the filter toward the front, or lifting one edge and lowering the other. Support the filter with your free hand so it does not fall onto the cooktop.
Some models have two or more filters. Note their order and orientation. Take a quick photograph before removal if the arrangement is not obvious.
Place the reusable metal filter in a sink or on a protected surface. Do not assume it is dishwasher-safe unless the manual says so. Aluminum filters can discolor or corrode in some dishwashers.
4. Locate and remove the old charcoal filter (3–7 minutes)
The charcoal filter may be clipped to the fan housing, held by a retaining wire, or positioned behind the metal grease filter. Release the clips or retainer gently. Avoid bending the fan blades, wiring, or surrounding sheet metal.
Some filters are round, while others are rectangular or shaped to fit around a blower wheel. Do not force a filter that seems too large. Remove the old filter and compare it with the replacement, checking overall length, width, thickness, mounting tabs, and any directional markings.
Charcoal filters are not normally washable or reusable. Water can damage the charcoal media and will not restore its odor-absorbing capacity.
5. Clean the filter area and grease filter (5–10 minutes)
Wipe accessible grease from the filter compartment, retaining clips, and nearby surfaces with a damp cloth and a small amount of degreasing dish soap. Keep moisture away from the motor, switches, light sockets, and wiring. Do not spray cleaner directly into the hood.
Wash the metal grease filter in warm water with dish soap, or follow the manufacturer’s cleaning instructions. Rinse it thoroughly and allow it to dry completely before reinstalling it. A damp filter can drip into the hood and may collect dust more quickly.
6. Install the new charcoal filter (3–5 minutes)
Position the replacement in the same direction as the old one. If the filter has a labeled side, arrow, tab, or printed surface, follow the manufacturer’s instructions. A combo filter may have a charcoal layer on one side and a grease-trapping layer on the other; install it in the orientation shown in the manual.
Press the filter into its clips or slide it into the retaining channel until it is secure. It should sit flat without bowing, scraping the blower, or leaving a visible gap around the frame. Never trim a filter to make it fit, and do not substitute ordinary activated-carbon sheet unless the hood manufacturer approves it.
7. Reinstall the grease filter and test the hood (3–5 minutes)
Return the clean, dry metal grease filter to its original position. Make sure every latch is engaged and that the filter does not move when lightly touched. Restore power, turn on the fan at each speed, and listen for rattling, scraping, or unusual vibration.
Hold a thin tissue near the intake area. It should be gently pulled toward the filter, not pushed away or caught by a loose edge. Check that the lights and fan work normally, then turn the hood off.
Mistakes to Avoid
- Ordering by appearance alone: Two filters can look similar but differ by a fraction of an inch. Match the model number and exact dimensions.
- Washing a charcoal filter: Charcoal cartridges are replacement items, not washable filters.
- Installing the filter backward: Follow the airflow arrow or the orientation of the original filter.
- Ignoring the metal grease filter: A clogged grease filter reduces airflow and can coat the charcoal filter with oil.
- Forcing clips or tabs: Stop if a retainer does not release easily. The part may need to slide before it lifts.
- Testing with loose parts: Never operate the hood while a filter, cover, or retaining clip is unsecured.
- Using a filter that blocks the blower: Excess thickness can create noise and strain the fan motor.
How Often
Replace a charcoal filter about every three to six months with regular cooking. Replace it sooner—often every one to three months—if you fry frequently, cook with a wok or high heat, prepare strongly scented foods, or use the hood for several hours per day.
A light-duty cook may get six to 12 months from a filter, but calendar time is less useful than actual condition. Persistent odors, visible darkening, a greasy surface, and weaker perceived airflow are signs that replacement is due. Clean the metal grease filter roughly monthly under typical use, or more often when it looks oily.
When to Call a Pro or Replace
Call a qualified appliance technician or electrician if the hood is hardwired and you are not comfortable shutting off or verifying the circuit, if wiring is damaged, or if the fan makes a grinding sound after the filter is installed. Professional help is also appropriate when the blower wheel is badly coated with grease, the motor overheats, or the hood trips a breaker.
Consider replacing the hood rather than only the filter if the motor has failed, the housing is heavily corroded, replacement filters are discontinued, or the unit cannot move air even with clean filters. A filter change cannot repair a failed fan or a blocked duct path.
FAQ
Can I use a charcoal filter in any range hood?
No. Charcoal filters are designed for specific ductless hood models and sizes. Verify the manufacturer’s part number, measurements, mounting style, and whether the hood uses a separate charcoal cartridge or a combination grease-and-charcoal filter.
How do I measure a replacement filter?
Remove the old filter and measure its length, width, and thickness at the widest points. Measure the frame, not just the charcoal pad. Also record the spacing and shape of tabs, clips, or mounting holes. A difference of even 1/4 inch can prevent proper installation.
Why does my kitchen still smell after replacing the filter?
Confirm that the filter is installed in the correct direction and that the fan is moving air. Then clean the metal grease filter and the accessible blower area. Odors may also remain in cabinets, walls, curtains, or nearby soft furnishings. If airflow is weak, the motor or internal passages may need service.
Can I run the hood without a charcoal filter?
A ductless hood may still run, but it will return cooking odors to the room and may allow more grease to reach the blower. Install the correct filter before regular use. Always keep the metal grease filter in place, whether the charcoal filter is separate or built into a combo cartridge.
