Furnace Filters
Best 16x28x4 Furnace Filter (2026): 5 Picks Compared
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For a furnace filter, the Aerostar leads this list: it is a MERV 11 pleated filter in a 4-pack with an actual size of 15.75 by 24.75 by 0.75 inches. If you want a 6-pack, the Frigidaire and Glasfloss come in 6-packs, while the Filtrete adds MPR 700 in a 4-pack.
Starting out? See the main guide: Best Furnace Air Filters
Top picks at a glance
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Best OverallAerostar Air Filter 16x25x1 MERV 11 AC9.8 View on Amazon -
Runner-UpFrigidaire 16x25x1 Air Filter9.7 View on Amazon -
Also GreatFiltrete 16x25x1 Air Filter9.6 View on Amazon -
Also GreatGlasfloss 16x25x1 Fiberglass Air Filters9.6 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. Aerostar Air Filter 16x25x1 MERV 11 AC | MERV 11 | 4-pack | — | — |
| 2. Frigidaire 16x25x1 Air Filter | MERV 8 | 6-pack | — | 90-day |
| 3. Filtrete 16x25x1 Air Filter | MERV 8 | — | — | — |
| 4. Glasfloss 16x25x1 Fiberglass Air Filters | — | 6-pack | — | — |
| 5. True Blue 116251 Furnace Air Filter 16x25x1 | — | — | — | — |
Aerostar Air Filter 16x25x1 MERV 11 AC
It is a MERV 11 pleated filter with synthetic media in a 4-pack, comparable to MPR 1200 and FPR 7.
- MERV rating: MERV 11
- Pack size: 4-pack
Good for
- Buyers who want MERV 11 filtration
- Buyers who want a 4-pack
Skip it if
- You want a filter above MERV 11
- You want a 6-pack
The electrostatically charged synthetic media sits in a beverage board frame with wire backing, and the actual size is 15.75 by 24.75 by 0.75 inches. It fits a standard 1-inch slot and comes in a 4-pack.
Frigidaire 16x25x1 Air Filter
It is a MERV 8 pleated filter with dual wire backing and electrostatic media in a 6-pack.
- MERV rating: MERV 8
- Pack size: 6-pack
- 90-day warranty stated
Good for
- Buyers who want a 6-pack
- Buyers who want a 90-day warranty
Skip it if
- You want a filter above MERV 8
- You want a 4-pack
It is a MERV 8 pleated filter with dual wire backing and electrostatic media, in a 6-pack with exact dimensions of 15.81 by 24.81 by 0.81 inches. It carries a limited 90-day manufacturer warranty.
Filtrete 16x25x1 Air Filter
It is a MERV 8 pleated filter rated MPR 700 in a 4-pack with 3-month changes.
- MERV rating: MERV 8
Good for
- Buyers who want MPR 700
- Buyers who want a 4-pack
Skip it if
- You want a filter above MERV 8
- You want a 6-pack
The 3-in-1 technology from 3M traps particles while letting air flow through, and the maker says to change it at least every 90 days. The Filtrete Smart App gives a 30, 60 or 90 day replacement countdown.
Glasfloss 16x25x1 Fiberglass Air Filters
Its fiberglass panel, double-strut design and 6-pack size cover everyday dust and lint with 10% greater open area.
- Pack size: 6-pack
Good for
- Buyers who want a 6-pack
- Buyers who want a disposable filter
Skip it if
- You want a pleated filter
- You want a 4-pack
It is a fiberglass panel filter in a 6-pack, with a double-strut design that opens 10% greater open area than a traditional metal grill filter. The actual size is 15-5/8 by 24-5/8 by 3/4 inches.
True Blue 116251 Furnace Air Filter 16x25x1
Its fiberglass media with gel adhesive and full depth loading gives high dust holding capacity for furnaces.
Good for
- Buyers who want fiberglass media
- Buyers who want a furnace filter
Skip it if
- You want a pleated filter
- You want a filter over 1 inch thick
It is a fiberglass panel filter for furnaces, with evenly coated media, gel adhesive to prevent finer particle migration, and full depth loading for high dust holding capacity. It slides into a furnace slot, measures 16 by 25 by 1 inches, and has a rectangular shape.
How to choose
MERV ratings and particle capture
MERV ratings show how fine a filter catches particles, with higher numbers for finer capture. The Aerostar rates MERV 11, comparable to MPR 1200 and FPR 7, while the Frigidaire and Filtrete rate MERV 8, with the Filtrete also rated MPR 700. For the Glasfloss and True Blue, compare media and construction instead.
Nominal size and actual size
Nominal size and actual size differ, so check both before buying. These listings carry a 16x25x1 nominal size, with actual sizes of 15.75 by 24.75 by 0.75 inches for the Aerostar, 15.81 by 24.81 by 0.81 inches for the Frigidaire, and 15-5/8 by 24-5/8 by 3/4 inches for the Glasfloss. The True Blue lists 16 by 25 by 1 inches. Measure your slot and match the actual size to it.
Pack sizes and replacement timing
Pack size and replacement timing decide your buying schedule. The Frigidaire and Glasfloss come in 6-packs, while the Aerostar and Filtrete come in 4-packs. The Aerostar lists replacement every 2 to 3 months, the Frigidaire every 3 months, and the Filtrete at least every 90 days. The Frigidaire carries a limited 90-day manufacturer warranty. Buy the pack size that matches your replacement schedule.
FAQ
What MERV ratings do these filters have?
The Aerostar rates MERV 11, and the Frigidaire and Filtrete rate MERV 8. The Aerostar is also comparable to MPR 1200 and FPR 7, and the Filtrete to MPR 700.
Which filters come in 6-packs?
The Frigidaire and Glasfloss come in 6-packs, while the Aerostar and Filtrete come in 4-packs.
What replacement intervals do these filters list?
The Aerostar lists replacement every 2 to 3 months, the Frigidaire every 3 months, and the Filtrete at least every 90 days.
What are the actual filter sizes?
The Aerostar measures 15.75 by 24.75 by 0.75 inches, the Frigidaire 15.81 by 24.81 by 0.81 inches, and the Glasfloss 15-5/8 by 24-5/8 by 3/4 inches.
