Furnace Filters
Best 20x30x2 Furnace Filter (2026): 4 Models Side by Side
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For a 20x30x2 furnace filter, the AIRx MERV 11 leads as Best Overall: it pairs a 6-pack with an actual size of 19.75 by 29.75 by 1.75 inches and a moisture-resistant frame. The Filter King is the most in the pack at 12 filters, while the Nordic Pure carries MERV 12 and the Glasfloss carries MERV 10.
Starting out? See the main guide: Best Furnace Air Filters
Top picks at a glance
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Best OverallAIRx Filters 20x30x2 Furnace AC Filter MERV9.8 View on Amazon -
Most in the PackFilter King 20x30x2 Air Filter MERV9.7 View on Amazon -
Also GreatNordic Pure 20x30x2 Pleated MERV 12 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. AIRx Filters 20x30x2 Furnace AC Filter MERV | MERV 11 | 6-pack | — | — |
| 2. Filter King 20x30x2 Air Filter MERV | MERV 8 | 12-pack | — | — |
| 3. Nordic Pure 20x30x2 Pleated MERV 12 Air | MERV 12 | 3-pack | — | — |
| 4. Glasfloss 20x30x2 MERV 10 Pleated AC Furnace | MERV 10 | 2-pack | — | — |
AIRx Filters 20x30x2 Furnace AC Filter MERV
Its MERV 11 pleated design pairs a 6-pack with a moisture-resistant double-wall frame for 20x30x2 systems.
- MERV rating: MERV 11
- Pack size: 6-pack
Good for
- Buyers who want a MERV 11 filter in a 6-pack
- Buyers who want an actual size of 19.75 by 29.75 inches
Skip it if
- You want a MERV rating above 11
- You want a pack larger than 6 filters
The pleated design gives a larger surface area, and the moisture-resistant double-wall beverage board frame withstands temperatures up to 180°F. Replace it every 60 to 90 days, and it comes as a 6-pack made in the USA.
Filter King 20x30x2 Air Filter MERV
Its MERV 8 pleated design pairs a 12-pack with up to 90 days of use per filter.
- MERV rating: MERV 8
- Pack size: 12-pack, the most here
Good for
- Buyers who want a 12-pack of MERV 8 filters
- Buyers who want a filter that lasts up to 90 days
Skip it if
- You want a MERV rating above 8
- You want a pack smaller than 12 filters
It fits 20x30x2 systems with an actual size of 19.5 by 29.5 by 1.75 inches, in a 12-pack of MERV 8 pleated filters. The pleated design captures more particles, and the polypropylene build comes from Filter King. It lasts up to 90 days before needing replacement, with a simple slide-in fit.
Nordic Pure 20x30x2 Pleated MERV 12 Air
Its MERV 12 pleated design pairs a 3-pack with electrostatically charged media for 20x30x2 systems.
- MERV rating: MERV 12
- Pack size: 3-pack
Good for
- Buyers who want a MERV 12 filter in a 3-pack
- Buyers who want an electrostatically charged pleated media
Skip it if
- You want a MERV rating above 12
- You want a pack larger than 3 filters
It fits 20x30x2 systems with an actual size of 19.75 by 29.75 by 1.75 inches, in a 3-pack of MERV 12 pleated filters. It is equivalent to MPR 1500 to 1900, and it is made in the USA.
Glasfloss 20x30x2 MERV 10 Pleated AC Furnace
Its MERV 10 pleated design pairs a 2-pack with a heavy-duty frame and an exact 19-5/8 inch size.
- MERV rating: MERV 10
- Pack size: 2-pack
Good for
- Buyers who want a MERV 10 filter in a 2-pack
- Buyers who want a heavy-duty frame
Skip it if
- You want a MERV rating above 10
- You want a pack larger than 2 filters
It fits 20x30x2 systems with an exact size of 19-5/8 by 29-5/8 by 1-3/4 inches, in a 2-pack of MERV 10 pleated filters. The heavy-duty frame suits residential and commercial use, and the pressure drop is comparable to a MERV 8. It is made in the USA, with a rectangular shape for furnace systems.
How to choose
Match MERV to your system
MERV ratings here are 11 for the AIRx, 8 for the Filter King, 12 for the Nordic Pure and 10 for the Glasfloss. A higher MERV number means finer filtration on the rating scale, so match the rating to your system. Check the MERV figure before you buy, since it decides what the pleated media traps.
Pack sizes compared
Pack sizes here are 6 for the AIRx, 12 for the Filter King, 3 for the Nordic Pure and 2 for the Glasfloss. A larger pack means fewer orders over a year of changes, while a smaller pack suits trying one filter first. The Filter King holds the most filters in one pack, at 12.
Check the actual size
Nominal size is 20x30x2 for all four, but actual sizes differ. The AIRx measures 19.75 by 29.75 by 1.75 inches. The Filter King measures 19.5 by 29.5 by 1.75 inches. The Nordic Pure measures 19.75 by 29.75 by 1.75 inches. The Glasfloss measures 19-5/8 by 29-5/8 by 1-3/4 inches. Measure your slot against the actual size before you order.
FAQ
What MERV ratings do these filters carry?
The AIRx carries MERV 11, the Filter King carries MERV 8, the Nordic Pure carries MERV 12, and the Glasfloss carries MERV 10.
How many filters come in each pack?
The AIRx comes in a 6-pack, the Filter King in a 12-pack, the Nordic Pure in a 3-pack, and the Glasfloss in a 2-pack.
What actual sizes do these filters measure?
The AIRx measures 19.75 by 29.75 by 1.75 inches. The Filter King measures 19.5 by 29.5 by 1.75 inches. The Nordic Pure measures 19.75 by 29.75 by 1.75 inches. The Glasfloss measures 19-5/8 by 29-5/8 by 1-3/4 inches.
When should the AIRx and Filter King be replaced?
The AIRx should be replaced every 60 to 90 days. The Filter King lasts up to 90 days before needing replacement.
