Furnace Filters
Best Oil Furnace Filter (2026): 5 Picks Compared
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The Filtrete 16x25x1 furnace filter leads this list as a MERV 11 2-pack with MPR 1000 and pleated 3-in-1 technology. The Aerostar runner-up matches MERV 11 at MPR 1200 in a 6-pack, while the Flanders carries the most filters in one box at 12.
Starting out? See the main guide: Best Furnace Air Filters
Top picks at a glance
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Best OverallFiltrete 16x25x1 Air Filter9.8 View on Amazon -
9.6 View on Amazon -
Also GreatSimply 16x25x1 Air Filter9.4 View on Amazon -
Most in the PackFlanders Disposable Air Filter E-Z Flow II9.3 View on Amazon -
Also GreatColorfil 16x25x1 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 16x25x1 Air Filter | MERV 11 | 2-pack | — | — |
| 2. Aerostar Air Filter 16x25x1 MERV 11 AC | MERV 11 | 6-pack | — | — |
| 3. Simply 16x25x1 Air Filter | MERV 8 | 4-pack | — | — |
| 4. Flanders Disposable Air Filter E-Z Flow II | MERV 4 | 12-pack | — | — |
| 5. Colorfil 16x25x1 Air Filter | MERV 8 | 2-pack | — | — |
Filtrete 16x25x1 Air Filter
A MERV 11 2-pack with MPR 1000, pleated 3-in-1 technology and a 90-day change interval.
- MERV rating: MERV 11
- Pack size: 2-pack
Good for
- Buyers who want MERV 11 filtration at MPR 1000
- Buyers who want a 2-pack for 3-month changes
Skip it if
- You need a MERV rating above 11
- You need more than 2 filters in the box
The 3-in-1 technology pulls in and traps particles, with a 1000 MPR and MERV 11 rating. The 2-pack covers 3-month filters, and the maker advises changing at least once every 90 days. A smart app sets 30-, 60- or 90-day reminders. It fits furnaces, air conditioners and heating systems.
Aerostar Air Filter 16x25x1 MERV 11 AC
A MERV 11 6-pack at MPR 1200, with pleated, electrostatically charged media that traps up to 95% of airborne particles.
- MERV rating: MERV 11
- Pack size: 6-pack
Good for
- Buyers who want MERV 11 filtration at MPR 1200
- Buyers who want a 6-pack with wire backing
Skip it if
- You need a MERV rating above 11
- You need a pack smaller than 6 filters
A beverage board frame with wire backing resists humidity and temperature changes. The actual size is 15.75 by 24.75 by 0.75 inches, and replacement runs every 2 to 3 months. It fits standard residential and commercial systems with a 1-inch slot.
Simply 16x25x1 Air Filter
A MERV 8 4-pack with pleated media on a beverage board frame, trapping 90% of airborne particles for up to 3 months.
- MERV rating: MERV 8
- Pack size: 4-pack
Good for
- Buyers who want a MERV 8 4-pack for furnaces
- Buyers who want pleated media with wire mesh
Skip it if
- You need a MERV rating above 8
- You need a pack smaller than 4 filters
The pleated media sits on a 24-point beverage board with hot-rolled steel wire mesh, in cardboard and paper material. The actual size is 15.75 by 24.75 by 0.75 inches, and filtration lasts up to 3 months. It slides into central units or return grilles following the airflow arrows.
Flanders Disposable Air Filter E-Z Flow II
A MERV 4 panel filter in a 12-pack, with glass material for basic dust and lint capture in standard furnaces.
- MERV rating: MERV 4
- Pack size: 12-pack, the most here
Good for
- Buyers who want the most filters in one box
- Buyers who want a simple panel filter
Skip it if
- You need a MERV rating above 4
- You need a pleated filter
The panel filter uses glass material in a flat panel build. It captures dust, lint and airborne particles at MERV 4 for standard residential furnaces and air conditioners. The 12-pack keeps spares on hand for regular changes. At 1.814 kg per pack, it stays light for slide-in replacement.
Colorfil 16x25x1 Air Filter
A MERV 8 2-pack with pleated polyester media and a pink-to-yellow color shift that signals change time.
- MERV rating: MERV 8
- Pack size: 2-pack
Good for
- Buyers who want a color-change signal for changes
- Buyers who want odor absorption without added scents
Skip it if
- You need a MERV rating above 8
- You need an exact size of 15.75 by 24.75 inches
The pleated polyester media starts pink and shifts to yellow with use as it absorbs gas-phase odors. The exact size is 15.5 by 24.5 by 0.75 inches, and the 2-pack slides into air conditioners, heaters or HVAC systems. It is made in the USA.
How to choose
Read MERV and MPR together
MERV rates how well a filter captures particles, and MPR is a separate maker scale for the same idea. The Filtrete and Aerostar sit at MERV 11, the Simply and Colorfil at MERV 8, and the Flanders at MERV 4. The Filtrete carries MPR 1000 and the Aerostar carries MPR 1200, so read MPR next to MERV, not instead of it. Higher MERV means finer capture, not a better fit.
Pleated versus panel filters
Four picks here use pleated media, which folds material to add surface area. The Flanders uses a flat glass panel instead, at MERV 4, for basic dust and lint capture. Pleated filters in this list run from MERV 8 to MERV 11, while the panel filter trades capture for a simple build. Match the build to the capture you need, not to the pack count.
Check actual size before ordering
Nominal size is not the size in the slot. The Aerostar and Simply measure 15.75 by 24.75 by 0.75 inches, the Colorfil measures 15.5 by 24.5 by 0.75 inches, and the Filtrete measures 15.68 by 24.68 by 0.81 inches. The Flanders size is nominal 16 by 25 by 1 inches. Measure your current filter frame or the slot itself, then match the actual size.
FAQ
What does MERV 11 mean for a furnace filter?
MERV rates particle capture, with higher numbers capturing finer particles. The Filtrete and Aerostar here sit at MERV 11, while the Simply and Colorfil sit at MERV 8 and the Flanders at MERV 4.
When should I replace a 16x25x1 filter?
The Filtrete needs changing at least every 90 days, and the Aerostar runs every 2 to 3 months. The Simply lasts up to 3 months per filter, and the Colorfil signals change time by turning from pink to yellow.
Do all five filters fit the same slot?
All five are nominal 16x25x1, but actual sizes differ. The Aerostar and Simply measure 15.75 by 24.75 by 0.75 inches, the Colorfil measures 15.5 by 24.5 by 0.75 inches, and the Filtrete measures 15.68 by 24.68 by 0.81 inches.
Which filter gives the most filters per box?
The Flanders 12-pack holds the most filters in one box. The Aerostar and Simply hold 6 and 4 filters, while the Filtrete and Colorfil hold 2 each.
