Furnace Filters
Best Furnace Air Filter 16x25x1 for Small Room (2026): 4 Picks Compared
As an Amazon Associate we earn from qualifying purchases. Specs below come from each product's Amazon listing; we do not test products in person.
For a small room with a 16x25x1 slot, the Amazon Basics MERV 5 leads this list: it is the lowest MERV here, and lower MERV ratings allow increased airflow, in a 6-pack for regular changes. The Filtrete MERV 12 follows with stronger capture and app reminders for changes.
Starting out? See the main guide: Best Furnace Air Filters
Top picks at a glance
-
Best OverallAmazon Basics MERV 5 AC Furnace Air9.8 View on Amazon -
Runner-UpFiltrete 16x25x1 Air Filter9.6 View on Amazon -
Also GreatSimply 16x25x1 Air Filter9.5 View on Amazon -
Also GreatWoosh 16x25x1 Refillable Air Filter MERV9.2 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. Amazon Basics MERV 5 AC Furnace Air | MERV 5 | 6-pack | — | — |
| 2. Filtrete 16x25x1 Air Filter | MERV 12 | 2-pack | — | — |
| 3. Simply 16x25x1 Air Filter | MERV 13 | 6-pack | — | — |
| 4. Woosh 16x25x1 Refillable Air Filter MERV | MERV 8 | 4-pack | — | 1-year |
Amazon Basics MERV 5 AC Furnace Air
Its MERV 5 rating allows increased airflow, in a 6-pack sized for regular changes in a small room.
- MERV rating: MERV 5
- Pack size: 6-pack
Good for
- Buyers who change filters every 60 to 90 days
- Buyers who want MERV 5 airflow in a small room
Skip it if
- You need a MERV rating above 5
- You want fewer than 6 filters per pack
The nominal size is 16x25x1 with an actual size of 15.75 by 24.75 by 0.75 inches, fitting standard furnaces, ACs and HVAC return grilles. The beverage board frame has wire mesh support, and the airflow arrow points toward the furnace or blower. It is rated MERV 5, and the listing advises replacement every 60 to 90 days.
Filtrete 16x25x1 Air Filter
Its MERV 12 rating with 1500 MPR suits stronger capture, in a 2-pack for 3-month changes.
- MERV rating: MERV 12
- Pack size: 2-pack
Good for
- Buyers who want MERV 12 capture in a small room
- Buyers who want app reminders for changes
Skip it if
- You need a MERV rating above 12
- You want more than 2 filters per pack
It carries a MERV 12 rating with 1500 MPR and a 54% small particle capture rate. The actual size is 15.62 by 24.62 by 0.78 inches, and the listing advises changing the filter at least once every 90 days. The Filtrete Smart App sets 30-, 60- or 90-day reminders, and the 2-pack includes two filters.
Simply 16x25x1 Air Filter
Its Merv 13 rating suits stronger capture, in a 6-pack for up to 3 months of filtration each.
- MERV rating: MERV 13
- Pack size: 6-pack
Good for
- Buyers who want Merv 13 capture in a small room
- Buyers who want 6 filters per pack
Skip it if
- You need a MERV rating above 13
- You want fewer than 6 filters per pack
It is rated Merv 13 with an actual size of 15.75 by 24.75 by 0.75 inches, matching the nominal 16x25x1 size. Filtration lasts up to 3 months, and the filters use 100% American components, including recycled materials.
Woosh 16x25x1 Refillable Air Filter MERV
Its reusable rigid frame with magnets holds the filter flush, in a 4-pack of MERV 8 refills.
- MERV rating: MERV 8
- Pack size: 4-pack
- 1-year warranty stated
Good for
- Buyers who want a reusable frame for refills
- Buyers who want magnetic fit for their slot
Skip it if
- You need a MERV rating above 8
- You want more than 4 refills per pack
The reusable polypropylene frame keeps its 15.50 by 24.50 by 0.75 inch size, and built-in magnets pull it flush to hold it in place. Pull-tabs help remove the filter, and the fold-flat design traps dust for disposal. It carries a 1-year warranty.
How to choose
MERV and airflow
MERV measures how much a filter captures, and the tradeoff is airflow. The Amazon Basics is rated MERV 5, the Woosh is rated MERV 8, the Filtrete is rated MERV 12, and the Simply is rated Merv 13. Higher MERV ratings capture smaller airborne particles, while lower MERV ratings allow for increased airflow, per the Amazon Basics listing. For a small room, weigh capture against airflow before picking the highest rating.
Size and fit
All four filters share the nominal 16x25x1 size, but actual sizes differ slightly. The Amazon Basics and Simply measure 15.75 by 24.75 by 0.75 inches, the Filtrete measures 15.62 by 24.62 by 0.78 inches, and the Woosh measures 15.50 by 24.50 by 0.75 inches. Select the nominal size based on the current filter frame or measurements, as the Amazon Basics listing advises, and check the actual size against the slot.
Changes and refills
Change timing differs by pick. The Amazon Basics listing advises replacement every 60 to 90 days. The Filtrete listing advises changing at least once every 90 days, and the Filtrete Smart App sets reminders. The Simply offers up to 3 months of filtration. The Woosh frame is bought once, and later changes use low-cost refills, with pull-tabs for removal and a fold-flat design that traps dust.
FAQ
What MERV rating do I need for a small room?
It depends on airflow versus capture. The Amazon Basics at MERV 5 allows increased airflow, the Woosh at MERV 8 sits in the middle, and the Filtrete at MERV 12 and the Simply at Merv 13 capture more. Pick the rating that fits the room and the system.
When should I change a 16x25x1 filter?
The Amazon Basics listing advises every 60 to 90 days, the Filtrete listing advises at least once every 90 days, and the Simply offers up to 3 months of filtration. The Woosh frame stays in place, and only the refill media is replaced.
What is a refillable filter frame?
The Woosh frame is a reusable rigid frame that stays in the system, so each change replaces only the filter media. Built-in magnets pull the frame flush, and pull-tabs help remove the filter for a fold-flat change.
