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Carrier 58MXA furnace: filter size

Carrier 58MXA filter sizes: 16 x 25 x 1, 20 x 25 x 1 and 24 x 25 x 1, 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:

Filter sizes by cabinet / model

Sizes found in the source table
16 x 25 x 1
20 x 25 x 1
24 x 25 x 1

Extracted by script from the linked document. Read the excerpt to see which size applies to which cabinet or return.

Close-up of a pleated furnace air filter
Illustration only. Not this manufacturer's part.

Replacement interval

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.

Before you buy

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.

MERV notes

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.

Related models

Where this data came from

Manufacturer document for Carrier 58MXA
Last checked 2026-11-05. Manufacturers revise documents. If your unit's label disagrees, trust the label.

Excerpt from the source

mine location for filter and relocate filter retaining wire, if
                                                                                  need to be cut to fit some furnace widths. Install filter as shown in
necessary. See Table 2 to determine correct filter size for desired
                                                                                  Fig. 24.
filter location. Table 2 indicates filter size, location, and quantity
shipped with this furnace. See Fig. 2 for location and size of                    NOTE: Remove and discard bottom closure panel when bottom
bottom and side return-air openings.                                              inlet is used.
                                                                           18
                                                                                          171⁄2-IN. WIDE
                   Table 2—Filter Information                                             CASINGS ONLY:
                                                                                          INSTALL FIELD-SUPPLIED
     AIR FILTER LOCATED IN BLOWER COMPARTMENT                                             FILTER FILLER STRIP
                                                                                          UNDER FILTER.
 FURNACE                FILTER SIZE (IN.)            FILTER
  CASING
                  Side Return       Bottom  Return    TYPE
 WIDTH (IN.)
                                                                                            3″
   17–1/2      (1) 16 X 25 X 1†    (1) 16 X 25 X 1† Cleanable
                                                                                                      24 1/2″
     21        (1) 16 X 25 X 1*    (1) 20 X 25 X 1† Cleanable
   24–1/2    (1 or 2) 16 X 25 X 1* (1) 24 X 25 X 1† Cleanable
* Filters may be field modified by cutting filter material and support rods (3) in                              1″
filters. Alternate sizes and additional filters may be ordered from your dealer.
† Factory-provided with furnace.

FAQ

What size filter does the Carrier 58MXA use?

Carrier 58MXA filter sizes: 16 x 25 x 1, 20 x 25 x 1 and 24 x 25 x 1, 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. 16 x 25 x 1; 20 x 25 x 1; 24 x 25 x 1.

How often should I replace the Carrier 58MXA filter?

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.

Why doesn't my filter measure exactly 16 x 25?

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.

How thick is the Carrier 58MXA filter?

Every size found in the source table is 1 in. thick: 16 x 25 x 1, 20 x 25 x 1 and 24 x 25 x 1. Pending human review; check the excerpt.

Where does this information come from?

Manufacturer document for Carrier 58MXA (https://www.shareddocs.com/hvac/docs/1009/Public/06/58MXA-18SI.pdf), last checked 2026-11-05.