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Our script found these filter sizes in the Carrier 59SC5B source document's filter table: 14x25x3/4, 16x25x3/4, 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 found in the source table |
|---|
| 14 x 25 x 3/4 |
| 16 x 25 x 3/4 |
| 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 59SC5B
Last checked 2026-10-26. Manufacturers revise documents. If your unit's label disagrees, trust the label.
accessible when the furnace is installed and shall be of such a size that also be installed in the common return duct prior to entering the return
the heat exchanger can be viewed for possible openings using light air opening in any orientation.
assistance or a probe can be inserted for sampling the air stream. The Table 6 – Air Filter Selection and Duct Sizing - In. (mm)
cover attachment shall prevent leaks.
FURNACE FILTER SIZE
Connect supply-air duct to flanges on furnace supply-air outlet. Bend CASING SIDE BOTTOM FILTER TYPE*
flange upward to 90° with wide duct pliers. See Fig. 20. The supply-air WIDTH RETURN RETURN
duct must be connected to ONLY the furnace supply-outlet-air duct 16 x 25 x 3/4 14 x 25 x 3/4
14-3/16 (360) Washable
flanges or air conditioning coil casing (when used). DO NOT cut main (406 x 635 x 19) (356 x 635 x 19)
furnace casing side to attach supply air duct, humidifier, or other 17-1/2 (445)
(1) 16 x 25 x 3/4 (1) 16 x 25 x 3/4
Washable
accessories. All supply-side accessories MUST be connected to duct (406 x 635 x 19) (406 x 635 x 19)
external to furnace main casing. (1) 16 x 25 x 3/4 (1) 20 x 25 x 3/4
21 (533) Washable
(406 x 635 x 19) (508 x 635 x 19)
RetuOur script found these filter sizes in the Carrier 59SC5B source document's filter table: 14x25x3/4, 16x25x3/4, 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. 14 x 25 x 3/4; 16 x 25 x 3/4; 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 59SC5B (https://www.shareddocs.com/hvac/docs/1009/Public/06/59SC5B-04SI.pdf), last checked 2026-10-26.