Home › Furnace filters › 59SP6A
Carrier 59SP6A 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 59SP6A
Last checked 2026-11-01. Manufacturers revise documents. If your unit's label disagrees, trust the label.
59SP6A: Installation, Start-up, Operating, Service and Maintenance Instructions
Connect supply-air duct to flanges on furnace supply-air outlet. Bend Table 6 – Air Filter Selection and Duct Sizing - In. (mm)
flange upward to 90° with wide duct pliers. See Fig. 20. The supply-air FILTER
duct must be connected to ONLY the furnace supply-outlet-air duct CABINET
FILTER SIZE - IN (MM) FILTER TYPE
flanges or air conditioning coil casing (when used). DO NOT cut main HEIGHT
furnace casing side to attach supply air duct, humidifier, or other IN (MM)
accessories. All supply-side accessories MUST be connected to duct 14 x 25 x 3/4 Washable
14-3/16* (360)
external to furnace main casing. (356 x 635 x 19) or Media†
(1) 16 x 25 x 3/4*
Return Air Connections Washable
(406 x 635 x 19) or
The return-air duct may be connected to bottom of the furnace. The side 16 (406)
(1) 16 x 25 x 4-5/16 or Media†
of casing that faces downward may also be used for return air (406 x 635 x 110)
connection. A combination of the bottom and downward facing side may (1) 20 x 25 x 3/4*
also be used. The upward facing side of the casing cannot be used as a (508 x 635 x 19) or Washable
21 (533)
return air connection. See Fig. 23. Carrier 59SP6A 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 59SP6A (https://www.shareddocs.com/hvac/docs/1009/Public/0C/59SP6A-01SI.pdf), last checked 2026-11-01.