Furnace Filters
Best 14x20x1 Furnace Filter (2026): Our 5 Picks Ranked
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For the best 14x20x1 furnace filter, the Filtrete leads as Best Overall: it pairs MERV 11 with MPR 1000 in a 2-pack of 3-month pleated filters with a Smart App reminder. The Flanders runner-up pairs MERV 4 with a 12-pack of fiberglass panel filters, and the Aerostar adds MERV 8 with MPR 600 in a 6-pack.
Starting out? See the main guide: Best Furnace Air Filters
Top picks at a glance
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Best OverallFiltrete 14x20x1 Air Filter9.8 View on Amazon -
Runner-UpFlanders Air Filter Panel Ez Flow II9.4 View on Amazon -
Also GreatAerostar Air Filter 14x20x1 MERV 8 AC9.4 View on Amazon -
Also GreatColorfil 14x20x1 Air Filter9.3 View on Amazon -
Also GreatSimply 14x20x1 Air Filter9.2 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 14x20x1 Air Filter | MERV 11 | 2-pack | — | — |
| 2. Flanders Air Filter Panel Ez Flow II | MERV 4 | 12-pack | — | — |
| 3. Aerostar Air Filter 14x20x1 MERV 8 AC | MERV 8 | 6-pack | — | — |
| 4. Colorfil 14x20x1 Air Filter | MERV 8 | 2-pack | — | — |
| 5. Simply 14x20x1 Air Filter | MERV 8 | — | — | — |
Filtrete 14x20x1 Air Filter
It pairs MERV 11 with MPR 1000, a 2-pack of 3-month pleated filters, and a Smart App reminder.
- MERV rating: MERV 11
- Pack size: 2-pack
Good for
- Buyers who want a 14x20x1 slot with MERV 11
- Buyers who want a 2-pack for repeat changes
Skip it if
- You want a filter larger than 14x20x1
- You want a MERV figure past 11
The pleated polypropylene filters measure 13.68 x 19.68 x 0.81 actual, and the box holds 2 filters for furnace and air conditioner use. Change them at least once every 90 days, and the Smart App sets 30-, 60- or 90-day reminders. The 3-in-1 technology pulls in and traps particles while letting air flow through.
Flanders Air Filter Panel Ez Flow II
It pairs MERV 4 with a 12-pack of flat fiberglass panel filters at one inch thick.
- MERV rating: MERV 4
- Pack size: 12-pack
Good for
- Buyers who want a 14x20x1 slot with MERV 4
- Buyers who want a 12-pack for repeat changes
Skip it if
- You want a filter larger than 14x20x1
- You want a MERV figure past 4
It uses a flat panel style with fiberglass material and a one-inch thickness for easy installation and handling. The box holds 12 filters for furnace use, and the panel is made for residential furnace use.
Aerostar Air Filter 14x20x1 MERV 8 AC
It pairs MERV 8 with MPR 600, a 6-pack, electrostatically charged pleated media, and a 13.50 x 19.50 x 0.75 actual size.
- MERV rating: MERV 8
- Pack size: 6-pack
Good for
- Buyers who want a 14x20x1 slot with MERV 8
- Buyers who want electrostatically charged pleated media
Skip it if
- You want a filter larger than 14x20x1
- You want filtration past 3 months without a change
It fits most standard residential and commercial HVAC systems with a standard 1-inch filter slot, and it is comparable to MPR 600 and FPR 5 filters. The heavy-duty beverage board frame has moisture-resistant backing and reinforced pleats. Replacement is every 2 to 3 months, and it captures up to 90% of airborne particles.
Colorfil 14x20x1 Air Filter
It pairs MERV 8 with a 2-pack, a 13.5 x 19.5 x 0.75 exact size, and color-shift technology for odors.
- MERV rating: MERV 8
- Pack size: 2-pack
Good for
- Buyers who want a filter for cat and dog odor
- Buyers who want a color change to signal replacement
Skip it if
- You want a filter larger than 14x20x1
- You want a 6-pack for repeat changes
It uses polyester pleated media in a 2-pack with an exact size of 13.5 x 19.5 x 0.75 inches. The pink color slowly changes to yellow with use as it absorbs and neutralizes gas-phase odors, including cat and dog odor. It fits air conditioning units, heaters and other HVAC systems.
Simply 14x20x1 Air Filter
It pairs MERV 8 with a 4-pack, a 13.75 x 19.75 x 0.75 actual size, and an installation guide.
- MERV rating: MERV 8
Good for
- Buyers who want a 14x20x1 slot with MERV 8
- Buyers who want a 4-pack for repeat changes
Skip it if
- You want a filter larger than 14x20x1
- You want filtration past 3 months without a change
The pleated filters use a 24-point beverage board with hot-rolled steel wire mesh, and the particle size is 3.0 to 10.0 microns. The box holds 4 filters with an installation guide, and they give up to 3 months of filtration.
How to choose
Match the nominal size first
Start with the nominal size your slot takes. All five filters are 14x20x1 nominal, with actual sizes that vary slightly: the Filtrete is 13.68 x 19.68 x 0.81, the Aerostar is 13.50 x 19.50 x 0.75, the Colorfil is 13.5 x 19.5 x 0.75 and the Simply is 13.75 x 19.75 x 0.75. Check the actual size against your slot before ordering, and note the Flanders panel is one inch thick.
Understand MERV and MPR
MERV and MPR are two separate scales, so compare MERV figures with MERV figures and MPR figures with MPR figures. The Filtrete is MERV 11 with MPR 1000, the Aerostar is MERV 8 with MPR 600, and the Flanders is MERV 4. The Colorfil and Simply are MERV 8, and the Filtrete, Flanders, Aerostar, Colorfil and Simply come in 2-pack, 12-pack, 6-pack, 2-pack and 4-pack sizes for repeat changes.
Plan changes and upkeep
The Filtrete changes at least once every 90 days with a Smart App reminder at 30, 60 or 90 days. The Aerostar replaces every 2 to 3 months, and the Simply gives up to 3 months. The Colorfil pink color changes to yellow with use to show it is time for a change, and the Flanders panel is made for easy installation and handling.
FAQ
What MERV figures do these filters have?
The Filtrete is MERV 11, the Flanders is MERV 4, and the Aerostar, Colorfil and Simply are MERV 8.
What size furnace filter do I need?
Check the nominal size for your slot first. The Filtrete is 13.68 x 19.68 x 0.81 actual, the Aerostar is 13.50 x 19.50 x 0.75 actual, and the Colorfil is 13.5 x 19.5 x 0.75 exact. All five are 14x20x1 nominal.
How do I know when to change the filter?
The Filtrete changes at least once every 90 days, the Aerostar replaces every 2 to 3 months, and the Simply gives up to 3 months. The Colorfil pink color changes to yellow with use.
Which filters come in a 12-pack?
The Flanders comes in a 12-pack, while the Aerostar comes in a 6-pack, the Simply in a 4-pack, and the Filtrete and Colorfil in 2-packs.
