Furnace Filters
Best Permanent Furnace Filter (2026): Our 5 Picks Ranked
As an Amazon Associate I earn from qualifying purchases. Specs below come from each product's Amazon listing; we do not test products in person.
For a permanent furnace filter, the Nexiview 20x25x1 leads this list: it pairs a washable, reusable electrostatic design with a MERV 8 rating, an aluminum frame and a 12-month warranty. The KEYINGXUAN, UBeesize and Torjim filters also carry a MERV 8 rating, so slot size and warranty separate the picks. The Trophy Air brings 6 stages of aluminum and electrostatic media for a 16x25x1 slot.
Starting out? See the main guide: Best Furnace Air Filters
Top picks at a glance
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Best OverallNexiview 20x25x1 Furnace Filter-MERV89.8 View on Amazon -
9.7 View on Amazon -
9.6 View on Amazon -
9.2 View on Amazon -
9.2 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. Nexiview 20x25x1 Furnace Filter-MERV8 | MERV 8 | — | 12-month |
| 2. KEYINGXUAN 14x20x1 Reusable Air Filter | MERV 8 | — | — |
| 3. UBeesize 20x25x1 Reusable Electrostatic Air Filter HVAC | MERV 8 | — | — |
| 4. Torjim 20x25x1 MERV8 Washable & Reusable Electrostatic | MERV 8 | — | 12-month |
| 5. Trophy Air Washable & Reusable Electrostatic HVAC | — | — | — |
Nexiview 20x25x1 Furnace Filter-MERV8
A washable, reusable electrostatic filter with an aluminum frame, pleated layers and a MERV 8 rating, backed by a 12-month warranty.
- MERV rating: MERV 8
- 12-month warranty stated
Good for
- Owners of furnace slots sized 20x25x1 who want a washable filter
- Buyers who want an aluminum-frame filter they can wash
Skip it if
- Your furnace slot takes a different nominal size than 20x25x1
- You need a MERV rating above 8
It fits furnace, HVAC and AC systems, and it washes with water and a mild detergent before air drying. Cleaning every 3 months is recommended, and it carries a 12-month warranty.
KEYINGXUAN 14x20x1 Reusable Air Filter
A washable, reusable electrostatic filter with a 5-layer mesh, a MERV 8 rating and foam sealing strips in the box.
- MERV rating: MERV 8
Good for
- Owners of furnace slots sized 14x20x1 who want a washable filter
- Buyers who want foam sealing strips for a tight fit
Skip it if
- Your furnace slot takes a different nominal size than 14x20x1
- You need a MERV rating above 8
It washes with water and a small amount of detergent, then dries naturally. The box holds 1 reusable air filter, 1 instruction manual and 4 foam sealing strips.
UBeesize 20x25x1 Reusable Electrostatic Air Filter HVAC
A washable, reusable electrostatic filter with an aluminum frame, pleated layers and a MERV 8 rating, backed by a 5-year manufacturer warranty.
- MERV rating: MERV 8
Good for
- Owners of furnace slots sized 20x25x1 who want a washable filter
- Buyers who want an aluminum-frame filter with pleated layers
Skip it if
- Your furnace slot takes a different nominal size than 20x25x1
- You need a MERV rating above 8
It washes with water and a little detergent, then dries naturally for reinstallation. Cleaning every 3 months is recommended, with gloves not included, and it carries a 5-year manufacturer warranty.
Torjim 20x25x1 MERV8 Washable & Reusable Electrostatic
A washable, reusable electrostatic filter with an aluminum frame, pleated layers, a MERV 8 rating and a 12-month warranty.
- MERV rating: MERV 8
- 12-month warranty stated
Good for
- Owners of furnace slots sized 20x25x1 who want a washable filter
- Buyers who want an aluminum-frame filter they can wash
Skip it if
- Your furnace slot takes a different nominal size than 20x25x1
- You need a MERV rating above 8
It fits furnace, HVAC and AC systems, and it washes with water and a mild detergent before air drying. Cleaning every 3 months is recommended, and it carries a 12-month warranty.
Trophy Air Washable & Reusable Electrostatic HVAC
A washable, reusable electrostatic filter with 6 stages, four layers of high-grade aluminum and two layers of electrostatic media.
Good for
- Owners of furnace slots sized 16x25x1 who want a washable filter
- Buyers who want a 6-stage filter with aluminum layers
Skip it if
- Your furnace slot takes a different nominal size than 16x25x1
- You need more than 6 stages of filtration
It has four layers of high-grade aluminum and two layers of electrostatic media, for 6 stages in total. It slides into an HVAC system in seconds, and it is made in the United States. It fits a 16x25x1 slot.
How to choose
Match the nominal size first
Filter sizes are nominal, so the number on the box is not the exact measurement. The KEYINGXUAN is sold as 14x20x1 with an actual size of 13.5x19.5x0.8 inch, and the UBeesize is sold as 20x25x1 with an actual size of 19.75x24.65x0.82 inch. Measure the slot in your furnace and compare it with the actual size, not only the nominal size, before ordering.
What MERV 8 means
MERV rates how well a filter captures particles from the air passing through it. A higher MERV number means the filter captures smaller particles, while a lower number means coarser capture. The Nexiview, KEYINGXUAN, UBeesize and Torjim filters carry a MERV 8 rating.
Washing and upkeep
Washable filters are cleaned rather than replaced. The Nexiview and Torjim filters wash with water and a mild detergent and air dry, and cleaning every 3 months is recommended for both. The KEYINGXUAN washes with water and a small amount of detergent and dries naturally, and the UBeesize washes with water and a little detergent. Each filter is ready for reinstallation once dry.
FAQ
What size permanent furnace filter do I need?
Measure your furnace slot and match the nominal size, then check the actual size. The picks here cover 20x25x1, 14x20x1 and 16x25x1 slots.
How do you clean a washable furnace filter?
Wash it with water and detergent and let it dry before reinstallation. Cleaning every 3 months is recommended for the Nexiview, Torjim, KEYINGXUAN and UBeesize filters.
Do permanent furnace filters have a warranty?
The Nexiview and Torjim filters carry a 12-month warranty, and the UBeesize carries a 5-year manufacturer warranty.
What is a MERV 8 filter?
MERV 8 is the rating carried by the Nexiview, KEYINGXUAN, UBeesize and Torjim filters in this list. It sits on the MERV rating scale for particle capture.
