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Carrier 59SP6B filter sizes: 14 x 25 x 3/4, 16 x 25 x 3/4, 16 x 25 x 4-5/16, 20 x 25 x 3/4, 20 x 25 x 4-5/16, 24 x 25 x 3/4 and 24 x 25 x 4-5/16, as listed in the Carrier source document's filter table. Which size fits depends on your cabinet and return. This page is pending human review, so check the source excerpt below.
Auto-extracted · review pending Filter sizes auto-extracted from the manufacturer document.
Last checked against the manufacturer document:
| Sizes found in the source table |
|---|
| 14 x 25 x 3/4 |
| 16 x 25 x 3/4 |
| 16 x 25 x 4-5/16 |
| 20 x 25 x 3/4 |
| 20 x 25 x 4-5/16 |
| 24 x 25 x 3/4 |
| 24 x 25 x 4-5/16 |
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 59SP6B
Last checked 2026-11-05. Manufacturers revise documents. If your unit's label disagrees, trust the label.
*. Recommended to maintain air filter face velocity. See Product Data for part number
Table 9 – Air Filter Selection and Duct Sizing - In. (mm) Table 10 – Air Filter Located in Filter Cabinet
FURNACE FILTER SIZE FILTER
CASING CABINET FILTER
BOTTOM FILTER TYPE† FILTER SIZE - IN (MM)*
WIDTH* SIDE RETURN
RETURN
HEIGHT - IN TYPE†
(MM)
16 x 25 x 3/4 14 x 25 x 3/4
14-3/16 (360) Washable (1) 16 x 25 x 3/4 (406 x 635 x 19) or Washable or
(406 x 635 x 19) (356 x 635 x 19) 16 (406)
(1) 16 x 25 x 4-5/16 (406 x 635 x 110) Media
16 x 25 x 3/4 16 x 25 x 3/4
17-1/2 (445) Washable (1) 20 x 25 x 3/4* (508 x 635 x 19) or Washable or
(406 x 635 x 19) (406 x 635 x 19) 20 (508)
(1) 20 x 25 x 4-5/16 (508 x 635 x 110) Media*
16 x 25 x 3/4 20 x 25 x 3/4
21 (533) Washable (1) 24 x 25 x 3/4* (610 x 635 x 19) or Carrier 59SP6B filter sizes: 14 x 25 x 3/4, 16 x 25 x 3/4, 16 x 25 x 4-5/16, 20 x 25 x 3/4, 20 x 25 x 4-5/16, 24 x 25 x 3/4 and 24 x 25 x 4-5/16, as listed in the Carrier source document's filter table. Which size fits depends on your cabinet and return. This page is pending human review, so check the source excerpt below. 14 x 25 x 3/4; 16 x 25 x 3/4; 16 x 25 x 4-5/16; 20 x 25 x 3/4; 20 x 25 x 4-5/16; 24 x 25 x 3/4; 24 x 25 x 4-5/16.
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.
Sizes found in the source table, by thickness: 3/4 in.: 14 x 25 x 3/4, 16 x 25 x 3/4, 20 x 25 x 3/4, 24 x 25 x 3/4; 4-5/16 in.: 16 x 25 x 4-5/16, 20 x 25 x 4-5/16, 24 x 25 x 4-5/16. Pending human review; check the excerpt.
Manufacturer document for Carrier 59SP6B (https://www.shareddocs.com/hvac/docs/1009/Public/0D/59SP6B-03SI.pdf), last checked 2026-11-05.