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Carrier 58CU0B furnace: filter size

Carrier 58CU0B filter sizes: 16 x 25 x 3/4 and 20 x 25 x 3/4, 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 3/4
20 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.

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 58CU0B
Last checked 2026-11-05. Manufacturers revise documents. If your unit's label disagrees, trust the label.

Excerpt from the source

NOTE: If the filter has an airflow direction arrow, the arrow must point              8. If a greasy residue is present on blower wheel, remove wheel from
towards the blower.                                                                       the blower housing and wash it with an appropriate degreaser. To
               Table 22 – Filter Size Information (In. / mm)                              remove wheel:
  FURNACE                   FILTER SIZE (In. / mm)                                   NOTE: Before disassembly, mark blower motor, and blower housing so
   CASING                                                            FILTER          motor and each arm is positioned at the same location during
    WIDTH            Side Return             Bottom Return            TYPE           reassembly.
   In. (mm)                                                                               a. Disconnect power choke wires (if used) and ground wire
                    16 X 25 X 3/4            16 X 25 X 3/4                                   attached to blower housing.
 17-1/2 (445)
                   (406 x 635 x 19)         (406 x 635 x 19)        Washable*
                                                                                          b. Remove screws securing cutoff plate and remove cutoff plate
                     16 x 25 x 3/4           20 X 25 X 3/4                                   from housing.
   21 (533)
                   (406 x 635 x 19)         (508 x 635 x 19)        Washable*
                                                                                          c. Loosen set screw holding blower wheel on motor shaft (160+/-20
     *. Recommended                                                                          in.-lb. when reassembling).
                     Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
                                                                                 36
58CU0B: Installation, Start–Up, Operating and Service and Maintenance Instructions
     d. Remove bolts holding motor to blower housing and slide motor
        out of wheel (40+/-10 in.-lb. when reassembling).
     e. Remove blower wheel from housing.
                                                                                                             ! WARNING

FAQ

What size filter does the Carrier 58CU0B use?

Carrier 58CU0B filter sizes: 16 x 25 x 3/4 and 20 x 25 x 3/4, 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 3/4; 20 x 25 x 3/4.

How often should I replace the Carrier 58CU0B 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 58CU0B filter?

Every size found in the source table is 3/4 in. thick: 16 x 25 x 3/4 and 20 x 25 x 3/4. Pending human review; check the excerpt.

Where does this information come from?

Manufacturer document for Carrier 58CU0B (https://www.shareddocs.com/hvac/docs/1009/Public/0F/58CU0B-03SI.pdf), last checked 2026-11-05.