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Our script found these filter sizes in the Carrier 59MN7A source document's filter table: 16x25x3/4, 16x25x4, 20x25x3/4, 24x25x3/4. This page is pending human review, so check the source excerpt on the page to see which size applies to your cabinet and return.
Auto-extracted · review pending Filter sizes auto-extracted from the manufacturer document.
| Sizes / part numbers found in the source table |
|---|
| 16 x 25 x 3/4 |
| 16 x 25 x 4 |
| 20 x 25 x 3/4 |
| 24 x 25 x 3/4 |
Extracted by script from the linked document. Read the excerpt to see which size applies to which cabinet or return.
General guidance (not from this manual): check monthly and replace 1-in. filters every 1–3 months, or follow the filter maker's guidance and your owner's manual.
Pull the old filter and read the size printed on its frame. Nominal sizes are rounded up: a 15.5 x 24.5 in. filter is sold as 16 x 25.
Your furnace manual lists the filter's dimensions, not its MERV rating. Higher-MERV filters restrict more air. Manufacturers such as Carrier recommend keeping the clean-filter pressure drop under 0.2 in. w.c. (ideally under 0.1). Lennox warns that an over-restrictive filter can trip the high limit in winter and freeze the coil in summer. If you want MERV 11–13, a 4-in. media cabinet is the usual route. Ask an HVAC tech to check static pressure. Nominal sizes are rounded: a filter labeled 16 x 25 x 1 actually measures about 15.5 x 24.5 x 0.75.
Manufacturer document for Carrier 59MN7A
Last checked 2026-10-23. Manufacturers revise documents. If your unit's label disagrees, trust the label.
Table 7 – Air Filter Selection and Duct Sizing -- In. (mm)
FILTER SIZE
FURNACE CASING WIDTH FILTER TYPE
SIDE RETURN BOTTOM RETURN
16 x 25 x 3/4 16 x 25 x 3/4
17---1/2 (445) (406 x 635 x 19) (406 x 635 x 19) Washable*
16 x 25 x 3/4 20 x 25 x 3/4
21 (533) (406 x 635 x 19) (508 x 635 x 19) Washable*
59MN7A
16 x 25 x 3/4 24 x 25 x 3/4
24---1/2 (622) (406 x 635 x 19) (610 x 635 x 19) Washable*
* Recommended to maintain air filter face velocity. See Product Data for part number.
Air Filter Located in Filter Cabinet
FILTER CABINET HEIGHT --- IN (MM) FILTER SIZE --- IN (MM) FILTER TYPE
(1) 16 x 25 x 3/4*
(406 x 635 x 19) or
16 (406) Washable or Media*
(1) 16 x 25 x 4--- 5/16Our script found these filter sizes in the Carrier 59MN7A source document's filter table: 16x25x3/4, 16x25x4, 20x25x3/4, 24x25x3/4. This page is pending human review, so check the source excerpt on the page to see which size applies to your cabinet and return. 16 x 25 x 3/4; 16 x 25 x 4; 20 x 25 x 3/4; 24 x 25 x 3/4.
General guidance (not from this manual): check monthly and replace 1-in. filters every 1–3 months, or follow the filter maker's guidance and your owner's manual.
Filter sizes are nominal (rounded). A filter sold as 16 x 25 x 1 actually measures about 15.5 x 24.5 x 0.75 in. Buy by the nominal size printed on the frame.
Manufacturer document for Carrier 59MN7A (https://www.hvac.com/wp-content/uploads/2018/10/carrier_59MN7_installation.pdf), last checked 2026-10-23.