Furnace Filters
Best 16x25x5 Furnace Filter (2026): 5 Models Side by Side
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For a 16x25x5 furnace filter, the Lennox X6670 OEM leads in a 2-pack with MERV 11 pleated media for Lennox systems. The Filtrete runner-up is also MERV 11 in a 2-pack with a 12-month change interval, while the HEALTHY CLIMATE, GeneralAire and Trion picks are MERV 11 as well. Check actual size first, since depth runs from 4.31 to 5 inches across these five.
Starting out? See the main guide: Best Furnace Air Filters
Top picks at a glance
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Best OverallLennox X66709.8 View on Amazon -
Runner-UpFiltrete 16x25x5 Air Filter9.8 View on Amazon -
9.4 View on Amazon -
Also GreatGeneralAire # 4541 MERV 11 for #9.3 View on Amazon -
Also GreatTrion Air Bear 259112-1059.2 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. Lennox X6670 | MERV 11 | 2-pack | — | — |
| 2. Filtrete 16x25x5 Air Filter | MERV 11 | 2-pack | — | — |
| 3. CLIMATE Lennox X6670 16x25x5 Air Filter MERV | MERV 11 | 2-pack | — | — |
| 4. GeneralAire # 4541 MERV 11 for # | MERV 11 | — | — | — |
| 5. Trion Air Bear 259112-105 | MERV 11 | — | — | — |
Lennox X6670
A MERV 11 pleated OEM filter in a 2-pack, sized 25 by 16 by 5 inches for Lennox systems.
- MERV rating: MERV 11
- Pack size: 2-pack
Good for
- Buyers who want an OEM Lennox filter
- Buyers who want a 2-pack of MERV 11 filters
Skip it if
- You want a MERV rating above 11
- You want an actual depth below 5 inches
The Lennox X6670 is an OEM Healthy Climate filter with MERV 11 pleated media in a 2-pack. Its fiberglass construction slides into Lennox systems, and it measures 25 by 16 by 5 inches. It fits Lennox brand systems.
Filtrete 16x25x5 Air Filter
A MERV 11 filter in a 2-pack with MPR 1000, a 12-month change interval and an actual depth of 4.31 inches.
- MERV rating: MERV 11
- Pack size: 2-pack
Good for
- Buyers who want a 12-month filter change interval
- Buyers who want MERV 11 with MPR 1000
Skip it if
- You want a MERV rating above 11
- You want an actual depth below 4.31 inches
The Filtrete is a MERV 11 filter with MPR 1000 in a 2-pack, sized 15.63 by 24.74 by 4.31 inches. It uses 3-in-1 technology to pull in and trap particles, and it fits Lennox brand media air cleaners. Change it at least once every 12 months, and the Smart App sets 90-, 180- or 365-day reminders.
CLIMATE Lennox X6670 16x25x5 Air Filter MERV
A MERV 11 filter in a 2-pack with a cleaning cloth, sized 15.75 by 24.75 by 4.38 inches and lasting up to 1 year.
- MERV rating: MERV 11
- Pack size: 2-pack
Good for
- Buyers who want a cleaning cloth in the box
- Buyers who want a filter lasting up to 1 year
Skip it if
- You want a MERV rating above 11
- You want a change interval longer than 1 year
The HEALTHY CLIMATE X6670 is a MERV 11 filter in a 2-pack, sized 15.75 by 24.75 by 4.38 inches. It captures particles as small as 1.0 to 3.0 microns, fits X6660 HCC16-28 air cleaners and some Lennox, Carrier and Honeywell systems, and lasts up to 1 year with replacement every 6 to 12 months. A microfiber cleaning cloth is included.
GeneralAire # 4541 MERV 11 for #
A MERV 11 pleated filter in a case of 3 for GF 4511 ReservePro systems.
- MERV rating: MERV 11
Good for
- Buyers who want a case of 3 filters
- Buyers who want MERV 11 for ReservePro systems
Skip it if
- You want a MERV rating above 11
- You want a case smaller than 3 filters
The GeneralAire 4541 is a MERV 11 pleated filter in a case of 3, sized 15 5/8 by 24 3/16 by 4 15/16 inches. It fits GF 4511 ReservePro systems. Measure carefully before ordering, since several 16 by 25 by 5 variations exist.
Trion Air Bear 259112-105
A genuine Trion OEM MERV 11 pleated filter, sized 15 3/4 by 24 1/4 by 4 7/8 inches, not a replacement for a Lennox furnace filter.
- MERV rating: MERV 11
Good for
- Buyers who want a genuine Trion OEM filter
- Buyers who want MERV 11 pleated media
Skip it if
- You want a MERV rating above 11
- You want a filter made for Lennox furnaces
The Trion Air Bear is a genuine Trion OEM filter with MERV 11 filtration and synthetic polyester blend pleated media. Its actual size is 15 3/4 by 24 1/4 by 4 7/8 inches against a 16 by 25 by 5 nominal size. It is not a replacement for a Lennox furnace filter.
How to choose
MERV 11 across the group
Every pick here is MERV 11, so the rating alone will not separate them. MERV rates how well a filter captures particles, and all five use pleated media. The Filtrete adds MPR 1000, the Lennox OEM uses fiberglass pleated media, and the Trion uses a synthetic polyester blend. Compare pack size, actual size and fit instead of MERV when you choose.
Actual size and fit
Nominal size is not the size that fits your cabinet, so compare actual size before ordering. The Filtrete measures 15.63 by 24.74 by 4.31 inches, the HEALTHY CLIMATE measures 15.75 by 24.75 by 4.38 inches, and the GeneralAire measures 15 5/8 by 24 3/16 by 4 15/16 inches. The Filtrete fits Lennox media air cleaners, the HEALTHY CLIMATE fits X6660 HCC16-28 cleaners, and the Trion is not a replacement for a Lennox furnace filter.
Pack size and change interval
The Lennox OEM, Filtrete and HEALTHY CLIMATE come in 2-packs, and the GeneralAire comes in a case of 3. The Filtrete lasts 12 months before a change, and the HEALTHY CLIMATE lasts up to 1 year with replacement every 6 to 12 months. Count your cabinets and your calendar before you pick a pack.
FAQ
What MERV rating do these filters have?
All five are MERV 11, including the Lennox OEM, the Filtrete, the HEALTHY CLIMATE, the GeneralAire and the Trion.
What actual size should I check before ordering?
Check depth most of all: the Filtrete is 4.31 inches deep, the HEALTHY CLIMATE is 4.38, the Trion is 4 7/8, and the GeneralAire is 4 15/16. Length and width also vary slightly across the five.
When should I change each filter?
The Filtrete lasts 12 months before a change, and the HEALTHY CLIMATE lasts up to 1 year with replacement every 6 to 12 months.
Which filters fit Lennox systems?
The Lennox OEM fits Lennox systems, and the Filtrete fits Lennox brand media air cleaners. The Trion is not a replacement for a Lennox furnace filter.
