Furnace Filters
Best 20x24x2 Furnace Filters (2026): 5 Picks Compared
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For a 20x24x2 search, the Filtrete leads at MERV 11 and MPR 1000, but its actual size is 19.68 by 23.68 by 0.81 inches, so check your slot first. The Filter King and the Glasfloss match the 20x24x2 nominal size, at MERV 8 and MERV 10.
Starting out? See the main guide: Best Furnace Air Filters
Top picks at a glance
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Best OverallFiltrete 20x24x1 Air Filter9.8 View on Amazon -
Runner-UpFilter King 20x24x2 Air Filter9.7 View on Amazon -
Also GreatNordic Pure 20x25x2 Pleated MERV 12 Air9.5 View on Amazon -
Also GreatGlasfloss ZL 20x24x2 MERV 10 Pleated Air9.3 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 20x24x1 Air Filter | MERV 11 | 4-pack | — | — |
| 2. Filter King 20x24x2 Air Filter | MERV 8 | 12-pack | — | — |
| 3. Nordic Pure 20x25x2 Pleated MERV 12 Air | MERV 12 | 3-pack | — | — |
| 4. Glasfloss ZL 20x24x2 MERV 10 Pleated Air | MERV 10 | — | — | — |
| 5. WATTRIP 2-Pack 20x24x1 MERV 8 Reusable HVAC Electrostatic | MERV 8 | 2-pack | — | 1-year |
Filtrete 20x24x1 Air Filter
Its MERV 11 rating and MPR 1000 pair with 3-in-1 technology in a 4-pack of pleated filters.
- MERV rating: MERV 11
- Pack size: 4-pack
Good for
- Buyers who want a MERV 11 filter with MPR 1000
- Buyers who want 30, 60, or 90-day change reminders
Skip it if
- You need a filter with a 2-inch nominal thickness
- You want a pack larger than 4 filters
It uses Filtrete 3-in-1 technology to pull in and trap particles, and it covers microparticles from 0.3 to 1.0 in size. The pleated polypropylene filter changes at least once every 90 days, and the Filtrete Smart App sets 30, 60, or 90-day reminders. Its actual size is 19.68 by 23.68 by 0.81 inches.
Filter King 20x24x2 Air Filter
Its 20x24x2 nominal size pairs with a MERV 8 rating in a 12-pack of pleated electrostatic filters.
- MERV rating: MERV 8
- Pack size: 12-pack
Good for
- Buyers who want a 12-pack of 20x24x2 filters
- Buyers who want a filter made in the USA
Skip it if
- You need a MERV rating above MERV 8
- You want a pack smaller than 12 filters
Its actual size is 19.5 by 23.5 by 1.75 inches, and the pleated polypropylene design traps airborne particles without impacting airflow. It lasts up to 90 days before replacement, and installation follows an open, slide, and close pattern. It is made in the United States.
Nordic Pure 20x25x2 Pleated MERV 12 Air
Its MERV 12 rating, equal to MPR 1500 to 1900, comes in a 3-pack of pleated filters.
- MERV rating: MERV 12
- Pack size: 3-pack
Good for
- Buyers who want a MERV 12 filter
- Buyers who want a 3-pack made in the USA
Skip it if
- You need a 20x24x2 nominal size
- You want a pack larger than 3 filters
Its nominal size is 20 by 25 by 2 inches, with an actual size of 19.5 by 24.5 by 1.75 inches. Measure your current filter and compare it with the actual size before ordering. The pleated synthetic filter is made in the USA.
Glasfloss ZL 20x24x2 MERV 10 Pleated Air
Its 20x24x2 nominal size pairs with a MERV 10 rating and a durable heavy-duty frame.
- MERV rating: MERV 10
Good for
- Buyers who want a MERV 10 pleated filter
- Buyers who want a filter for residential or commercial use
Skip it if
- You need a MERV rating above MERV 10
- You want airflow beyond a MERV 8 level
Its exact size is 19-3/8 by 23-3/8 by 1-3/4 inches, with a nominal size of 20 by 24 by 2 inches. The pleated metal filter rates MERV 10, comparable to MPR 600 to 800, and its airflow compares with a MERV 8 filter. It is made in the USA and suits residential and commercial use.
WATTRIP 2-Pack 20x24x1 MERV 8 Reusable HVAC Electrostatic
Its washable reusable design pairs with a MERV 8 rating and a 1-year warranty.
- MERV rating: MERV 8
- Pack size: 2-pack
- 1-year warranty stated
Good for
- Buyers who want a washable filter they can reuse
- Buyers who want a filter with a metal frame
Skip it if
- You need a filter with a 2-inch nominal thickness
- You want a pack larger than 2 filters
It has a reinforced aluminum frame with painted steel mesh, and 7 layers: 4 layers of metal mesh, 2 layers of nylon media, and 1 filter cotton layer. Rinse or vacuum it every 1 to 3 months, and let it dry completely before reinstalling. Its actual size is 19-5/8 by 23-5/8 by 7/8 inches, and it carries a 1-year warranty.
How to choose
Check actual size, not nominal size
Nominal size and actual size differ on every pick here. The Filtrete lists 20 by 24 by 1 nominal with an actual size of 19.68 by 23.68 by 0.81 inches, while the Nordic Pure lists 20 by 25 by 2 nominal with an actual size of 19.5 by 24.5 by 1.75 inches. Measure your current filter and your slot, then compare both numbers with the actual size before ordering.
Read MERV, MPR, and FPR separately
MERV, MPR, and FPR are three different rating scales, so compare like with like. Here the picks rate MERV 8, MERV 10, MERV 11, and MERV 12. The Filtrete also gives MPR 1000, the Nordic Pure equals MPR 1500 to 1900, and the Glasfloss compares with MPR 600 to 800. A higher number on one scale does not convert directly to another scale, so check which scale each pick gives.
Plan replacement or washing
Pleated filters get replaced, while the WATTRIP filter gets washed and reused. The Filtrete changes at least once every 90 days, the Filter King lasts up to 90 days, and the WATTRIP washes every 1 to 3 months with drying before reinstalling. Set a reminder for the interval your pick gives: the Filtrete Smart App sets 30, 60, or 90-day reminders.
FAQ
Do all five picks match the 20x24x2 nominal size?
No. The Filter King and the Glasfloss match 20x24x2 nominal, while the Filtrete and the WATTRIP are 20x24x1 nominal and the Nordic Pure is 20x25x2 nominal.
What MERV rating does the Nordic Pure filter carry?
It rates MERV 12, equivalent to MPR 1500 to 1900, in a 3-pack of pleated filters made in the USA.
Which pick can be washed and reused?
The WATTRIP filter is washable and reusable: rinse or vacuum it every 1 to 3 months and let it dry completely before reinstalling.
When should the Filtrete filter change?
Change it at least once every 90 days, and the Filtrete Smart App can set 30, 60, or 90-day reminders.
