3M Filtrete Filters Compared: Sizes, MERV Levels and Purifier Fits

Best for
Owners of Filtrete C01 and T02 purifiers

The 4 Pack F1 Replacement Filters Compatible with 3M Filtrete Air Purifier are made by Borgodf, not Filtrete. They are designed for Filtrete room purifiers in the C01 and T02 series, specifically models FAP-C01-F1, FAP-C01BA-G1, FAP-T02-F1, FAP-T02WA-G1, FAP-ST02W and FAP-ST02N.

Borgodf describes them as True HEPA filters that capture 99.97% of airborne particles as small as 0.3 micron, made with FSC-certified paper. They replace without tools, and the seller recommends a change every 3 to 6 months. A four-pack covers a year or more at that pace, which suits a purifier running beside a gaming desk all day.

Check your model number before buying. If your purifier is a C02, C03 or T03 model, the F2 A2 filters below are the right fit instead. For other purifier brands, our air purifier filter replacement guide covers a different lineup.

• Fits Filtrete C01 and T02 series models listed
• True HEPA claim, 99.97% at 0.3 micron
• Four filters per pack
• Replace every 3 to 6 months

Best for
Owners of Filtrete F2 and A2 purifiers

The 2 Pack F2 A2 Replacement Filters are from LINNIW, also a third-party brand. They fit Filtrete room purifier models FAP-C02WA-G2, FAP-C03BA-G2, FAP-T03BA-G2, FAP-SC02W and FAP-SC02N, and the A2 models FAP-C02-A2, FAP-C03-A2 and FAP-T03-A2. The listing is refreshingly clear that they are not compatible with the C01 and T02 F1 models.

LINNIW claims 99.97% filtration of particles as small as 0.3 microns, including fine dust, pollen, smoke, odors and pet dander, and recommends replacing every six months with continuous use. Each filter measures 13 by 8.2 by 1.89 inches. The specifications are muddled, though: they list a MERV 14 rating and carbon fiber as the material, while the features describe a HEPA filter made of FSC-certified paper. Treat the HEPA claim as the seller’s description and the spec fields as inconsistent.

Pick this if your purifier is on the compatible list. Two filters cover about a year of round-the-clock use.

Best for
Allergy-aware homes with 16x25x1 slots

The Filtrete 16x25x1 Air Filter is Filtrete’s MERV 11, MPR 1000 filter in one of the most common HVAC sizes, sold as a four-pack. Filtrete’s 3-in-1 technology is designed to capture microparticles such as pet dander, smoke and smog, as well as larger lint, pollen and household dust, and the filter is certified asthma and allergy-friendly.

The actual size is 15.68 by 24.68 by 0.81 inches, slightly smaller than the nominal 16x25x1, which is normal for HVAC filters. Filtrete recommends changing it at least every 90 days, and the Filtrete Smart App for iOS or Android can send 30, 60 or 90 day reminders. The four-pack covers a full year at the recommended pace.

This is the pick for 16x25x1 slots when you want a noticeable upgrade over basic dust filters. For whole-home dust control around a PC setup, MERV 11 catches much finer particles than MERV 5.

• MERV 11, MPR 1000
• Asthma and allergy-friendly certification
• Four filters, 3-month life each
• Filtrete Smart App reminders

Best for
Basic dust control in 20x30x1 systems

The Filtrete 20x30x1 Air Filter MERV 5 is Filtrete’s Basic Dust Defense filter, rated MPR 300. It comes as a six-pack of pleated electrostatic filters with an actual size of 19.81 by 29.81 by 0.81 inches, slide-in mounting and a rectangular shape.

At MERV 5 it targets lint, household dust and dust mite debris rather than finer microparticles like smoke or pet dander. Filtrete says it outperforms fiberglass, washable and non-electrostatic filters, and it uses the same 90-day change interval and Smart App reminders. The listing does not mention allergy certification.

Choose this if your system takes 20x30x1 and you mainly want basic dust control. If you have pets or allergies, a MERV 11 filter in the correct size is the better investment, and this listing only covers 20x30x1.

Best for
Allergy-aware homes with 20x25x1 slots

The Filtrete 20x25x1 Air Filter is the same MERV 11, MPR 1000 filter in the 20x25x1 size, sold as a two-pack. The actual size is 19.68 by 24.68 by 0.81 inches. It carries the same asthma and allergy-friendly certification and 3-in-1 technology, and Filtrete notes it is backed by a 2024 brand survey on residential HVAC filters.

It should be changed at least every 90 days, so a two-pack covers about six months. Pick this if your return is 20x25x1 and you want finer filtration.

Best for
Smaller returns needing 16x20x1

The Filtrete 16x20x1 Air Filter is the MERV 11, MPR 1000 filter in the smaller 16x20x1 size, as a two-pack. The title gives an actual size of 15.68 by 19.68 by 0.81 inches. The specifications list 21 by 16.38 by 2.5 inches, which looks like packaging rather than the filter itself, so go by the title’s actual size.

It shares the 3-in-1 technology, allergy-friendly certification, 90-day change interval and Smart App reminders. It suits smaller return grilles, and some homes use several. Our dehumidifier filter guide is useful if you also run a dehumidifier in a basement game room.