Furnace Filters
Best Washable Furnace Filter (2026): Top 5 by the Specs
As an Amazon Associate we earn from qualifying purchases. Specs below come from each product's Amazon listing; we do not test products in person.
For the best washable furnace filter, the UBeesize 20x25x1 pairs MERV 8 pleated layers with an aluminum frame and a 5-year warranty. The REAIR and Torjim also fit 20x25x1 slots, while the K&N and ZHIANZAN fit 16x25x1 slots, so size narrows the choice first.
Starting out? See the main guide: Best Furnace Air Filters
Top picks at a glance
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9.8 View on Amazon -
Runner-UpREAIR 20x25x1 Air filter9.7 View on Amazon -
9.5 View on Amazon -
Also GreatK&N 16X25X1 HVAC Furnace Air Filter9.3 View on Amazon -
Also GreatZHIANZAN 16x25x1 HVAC Furnace Air Filter9.2 View on Amazon
Compare the specs
Ranked on from each listing, plus how many buyers have rated it. A dash (—) means we could not confirm that figure from the listing.
| Pick | MERV rating | Weight | Warranty |
|---|---|---|---|
| 1. UBeesize 20x25x1 Reusable Electrostatic Air Filter HVAC | MERV 8 | — | 5-year |
| 2. REAIR 20x25x1 Air filter | MERV 8 | — | 5-year |
| 3. Torjim 20x25x1 MERV8 Washable & Reusable Electrostatic | MERV 8 | — | 12-month |
| 4. K&N 16X25X1 HVAC Furnace Air Filter | MERV 8 | — | 26-year |
| 5. ZHIANZAN 16x25x1 HVAC Furnace Air Filter | MERV 8 | — | — |
UBeesize 20x25x1 Reusable Electrostatic Air Filter HVAC
Its aluminum frame, MERV 8 pleated layers and 5-year warranty make it the Best Overall pick for a 20x25x1 slot.
- MERV rating: MERV 8
- 5-year warranty stated
Good for
- Owners of furnace, HVAC or AC systems with a 20x25x1 slot
- Buyers who want an aluminum-frame filter with a 5-year warranty
Skip it if
- You need a 16x25x1 filter for your slot
- You want a pleated polyester filter
It has an aluminum frame that holds its shape, pleated layers, and a MERV 8 level. Wash it with water and a little detergent every 3 months, let it dry naturally, then reinstall it. The box includes a manual, and the warranty runs 5 years.
REAIR 20x25x1 Air filter
It adds machine washing, a snap-on frame and low pressure drop figures to a MERV 8 20x25x1 filter.
- MERV rating: MERV 8
- 5-year warranty stated
Good for
- Owners of 20x25x1 slots who want a machine-washable filter
- Buyers who want a snap-on frame and a storage case
Skip it if
- You need a 16x25x1 filter for your slot
- You want a filter rated above MERV 8
It has a honeycomb structure with electrostatic filtration and pleated polyester media, rated MERV 8. Pressure drop is 0.38″ w.g. at 1367 CFM and 0.54″ w.g. at 1750 CFM under ASHRAE 52.2. Wash it every 30 to 60 days in a machine, and the box includes the filter, a snap-on frame and a storage case, with a 5-year warranty.
Torjim 20x25x1 MERV8 Washable & Reusable Electrostatic
It pairs an aluminum frame and MERV 8 pleated layers with a 12-month warranty for a 20x25x1 slot.
- MERV rating: MERV 8
- 12-month warranty stated
Good for
- Owners of 20x25x1 slots who want an aluminum-frame filter
- Buyers who want MERV 8 filtration with a 12-month warranty
Skip it if
- You need a 16x25x1 filter for your slot
- You want a warranty longer than 12 months
It has an aluminum frame, pleated layers and electrostatic filtration at MERV 8. Wash it with water and a mild detergent every 3 months, let it air dry, then reinstall it. The box includes the 20x25x1 filter, with 12 months of warranty and lifetime customer service.
K&N 16X25X1 HVAC Furnace Air Filter
It gives 16x25x1 buyers a washable pleated polyester filter backed by a 26-year warranty.
- MERV rating: MERV 8
- 26-year warranty stated
Good for
- Owners of 16x25x1 furnace slots who want a washable filter
- Buyers who want a pleated polyester filter with a 26-year warranty
Skip it if
- You need a 20x25x1 filter for your slot
- You need a filter for a commercial HVAC system
It is a pleated polyester filter for a 16x25x1 furnace slot, rated MERV 8. Rinse it and reinstall it for repeated use, and it holds its shape through repeated cleanings. It fits standard HVAC systems with a direct installation, and it supports steady airflow for consistent temperature control. The warranty runs 26 years.
ZHIANZAN 16x25x1 HVAC Furnace Air Filter
It gives 16x25x1 buyers a washable electrostatic filter that slides into place in seconds.
- MERV rating: MERV 8
Good for
- Owners of 16x25x1 slots who want a slide-in filter
- Buyers who want an electrostatic filter they can wash and reuse
Skip it if
- You need a 20x25x1 filter for your slot
- You need a filter for a commercial HVAC system
It is a washable electrostatic filter for a 16x25x1 HVAC furnace slot, rated MERV 8. Slide it into your system with the slide-in mounting, and clean it and reuse it many times. The box includes one 16x25x1 filter.
How to choose
Match the size to your slot
Three picks here are 20x25x1: the UBeesize, the REAIR and the Torjim. Two picks are 16x25x1: the K&N and the ZHIANZAN. Check the nominal size your system takes before you buy, since a filter sized for one slot will not fit another. The UBeesize actual size is 19.75x24.65x0.82 inch, and the ZHIANZAN actual size is 15.5x24.5x0.82 inch, so compare both figures with your slot.
What MERV 8 means
MERV is a scale for how well a filter captures particles, and all five picks here are MERV 8. Within that shared level, compare the capture figures each maker gives: the UBeesize captures up to 90% of dust and pet hair, the REAIR captures 90% of 3-10-micron particles, and the Torjim captures up to 92% of pet hair. Use those figures, not the MERV number alone, when two picks look alike.
Washing and upkeep
Washable filters need regular cleaning to keep airflow steady. The UBeesize and the Torjim call for washing every 3 months with water and a mild detergent, then air drying before reinstalling. The REAIR calls for washing every 30 to 60 days and is machine washable. Rinse the K&N and reinstall it, and slide the ZHIANZAN out, clean it and slide it back in. Always let a washed filter dry before you reinstall it.
FAQ
What size washable furnace filter do I need?
Match the nominal size to your slot. Three picks here are 20x25x1 and two are 16x25x1, so check your current filter size first.
What wash schedule suits a washable furnace filter?
Follow the interval for your pick. The UBeesize and Torjim call for every 3 months, while the REAIR calls for every 30 to 60 days.
What does MERV 8 mean?
MERV is a scale for how well a filter captures particles. All five picks here are MERV 8, so compare their capture figures to tell them apart.
Can I wash and reuse these furnace filters?
Yes. Wash the UBeesize and Torjim with water and a mild detergent and let them air dry, machine wash the REAIR, and rinse and reinstall the K&N.
