Furnace Filters
Best 25x16x5 Furnace Filter (2026): 4 Models Side by Side
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For a 16x25x5 furnace filter, the Filtrete leads as Best Overall: it pairs MERV 11 with MPR 1000 in a 2-pack of 12-month filters. The GeneralAire runner-up adds MERV 11 in a case of 3 filters, while the Trion adds MERV 8 in a 3-pack and the Lennox adds MERV 11 in a 2-pack with a cleaning cloth.
Starting out? See the main guide: Best Furnace Air Filters
Top picks at a glance
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Best OverallFiltrete 16x25x5 Air Filter9.8 View on Amazon -
Runner-UpGeneralAire # 4541 MERV 11 for #9.7 View on Amazon -
Also GreatTrion Air Bear 255649-1059.3 View on Amazon -
9.2 View on Amazon
Compare the specs
Ranked on pack size 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 | Pack size | Weight | Warranty |
|---|---|---|---|---|
| 1. Filtrete 16x25x5 Air Filter | MERV 11 | 2-pack | — | — |
| 2. GeneralAire # 4541 MERV 11 for # | MERV 11 | 3-pack | — | — |
| 3. Trion Air Bear 255649-105 | MERV 8 | — | — | — |
| 4. CLIMATE Lennox X6670 16x25x5 Air Filter MERV | MERV 11 | 2-pack | — | — |
Filtrete 16x25x5 Air Filter
It pairs MERV 11 with MPR 1000 in a 2-pack of pleated 12-month filters for Lennox media air cleaners.
- MERV rating: MERV 11
- Pack size: 2-pack
Good for
- Buyers who want MERV 11 filtration
- Buyers who want a 2-pack of filters
Skip it if
- You want MERV above 11
- You want a pack larger than 2
It has a MERV 11 rating with 1000 MPR in a pleated design, and the 2-pack holds filters for 12 months. The filter fits Lennox brand media air cleaners, and the Filtrete Smart App sets 90-, 180- or 365-day reminders to change the filter. Change the 4-inch filter at least once every 12 months, and the box includes 2 filters.
GeneralAire # 4541 MERV 11 for #
It pairs MERV 11 with a case of 3 pleated 16x25x5 furnace filters.
- MERV rating: MERV 11
- Pack size: 3-pack
Good for
- Buyers who want MERV 11 filtration
- Buyers who want a case of 3 filters
Skip it if
- You want MERV above 11
- You want a case larger than 3 filters
It has a MERV 11 rating in a pleated rectangular design for furnaces, sold as a case of 3 filters. The actual size is 15 5/8 by 24 3/16 by 4 15/16 inches, so measure carefully before ordering, since several variations of 16x25x5 filters exist. Check the size against your slot before ordering.
Trion Air Bear 255649-105
It pairs MERV 8 filtration with a 3-pack of pleated filters in a slide-in design for furnaces.
- MERV rating: MERV 8
Good for
- Buyers who want MERV 8 filtration
- Buyers who want a 3-pack of filters
Skip it if
- You want MERV above 8
- You want a pack smaller than 3
It has MERV 8 filtration in a pleated cotton design with a nominal size of 16 by 25 by 5 inches. The actual size is 15 3/4 by 24 1/4 by 4 7/8 inches, and the filter slides into the furnace. It comes as a 3-pack of Trion filters. This is not a replacement for a Lennox furnace filter.
CLIMATE Lennox X6670 16x25x5 Air Filter MERV
It pairs MERV 11 with a 2-pack of filters that fit X6660 HCC16-28 air cleaners and include a cleaning cloth.
- MERV rating: MERV 11
- Pack size: 2-pack
Good for
- Buyers who want MERV 11 filtration
- Buyers who want a cleaning cloth included
Skip it if
- You want MERV above 11
- You want a pack larger than 2
It has a MERV 11 rating in a slide-in design with exact measurements of 15.75 by 24.75 by 4.38 inches. The filters fit X6660 HCC16-28 air cleaners and some Lennox, Carrier, and Honeywell systems, and a cleaning cloth is included. The filter lasts up to 1 year, with replacement every 6-12 months.
How to choose
MERV rating and pack size
MERV rating sets the filtration level, and pack size sets how many filters arrive in one box. The Filtrete, GeneralAire, and Lennox models carry MERV 11, while the Trion carries MERV 8. The Filtrete and Lennox models come as 2-packs, while the GeneralAire and Trion models come as 3-packs. Compare the MERV rating and the pack size against the filters you need on hand.
Size and fit
Nominal size and actual size differ, so check both before ordering. All four models carry a nominal size of 16 by 25 by 5 inches. The Filtrete fits Lennox brand media air cleaners, the Lennox fits X6660 HCC16-28 air cleaners and some Lennox, Carrier, and Honeywell systems, and the Trion is not a replacement for a Lennox furnace filter. Measure carefully, since several variations of 16x25x5 filters exist.
Replacement timing
The Filtrete filters change at least once every 12 months, and the Filtrete Smart App sets 90-, 180- or 365-day reminders. The Lennox filter lasts up to 1 year, with replacement every 6-12 months. Set a reminder that matches the interval for the filter you buy.
FAQ
Which filters carry MERV 11?
The Filtrete, GeneralAire, and Lennox models carry MERV 11, while the Trion carries MERV 8.
How many filters come in each pack?
The Filtrete and Lennox models come as 2-packs, while the GeneralAire and Trion models come as 3-packs.
Which filter fits Lennox media air cleaners?
The Filtrete fits Lennox brand media air cleaners, and the Lennox fits X6660 HCC16-28 air cleaners and some Lennox, Carrier, and Honeywell systems.
When should each filter be replaced?
The Filtrete filters change at least once every 12 months, and the Lennox filter lasts up to 1 year with replacement every 6-12 months.
