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Goodman GMS8 furnace: filter size

Goodman GMS8 filter sizes: 10 x 20, 14 x 20, 14 x 24, 14 x 25, 16 x 25, 20 x 25 and 24 x 24, as listed in the Goodman 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
10 x 20
14 x 20
14 x 24
14 x 25
16 x 25
20 x 25
24 x 24

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

Measuring a furnace air filter's edge with a tape measure
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.

Buy

Match the size or part number printed on your current filter.

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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 Goodman GMS8
Last checked 2026-10-27. Manufacturers revise documents. If your unit's label disagrees, trust the label.

Excerpt from the source

                      0403A*            0603A*          0604B*            0804B*               0805C*                  81005C*         1205D*          1405D*
                        (1) 16 x 25 (Side) or                                                (1) 16 x 25       (2) 16 x 25 (Side) or    (2) 16 x 25 (Side) or
Filter Size (in²)                                      (1) 16 x 25 (Side or Bottom)
                        (1) 14 x 24 (Bottom)                                             (Side or Bottom) ¹    (1) 20 x 25 (Bottom)     (1) 24 x 24 (Bottom)
                                GDS8                  GDS8                      GDS8                           GDS8
       Model #
                               0403A*                0603A*                    0804B*                         1005C*
                                      (2) 10 x 20 or                       (2) 14xX 20 or                  (2) 14 x 20 or
Filter Size (in²)
                                 (1) 14 x 25 (Top Return)             (1) 16 x 25 (Top Return)        (1) 20 x 25 (Top Return)
                                GHS8                  GHS8                      GHS8
       Model #
                               0403A*                0604B*                    0805C*
                        (1) 16 x 25 (Side) or       (1) 16 x 25               1 - 16 X 25
Filter Size (in²)
                        (1) 14 x 24 (Bottom)     (Side or Bottom)         (Side or Bottom) ¹
Note:  Other size filters of equal or greater surface area may be used; filters may also be centrally located.
¹ Use 2 - 16 x 25 filters on side returns or 20 x 25 filter on bottom return if furnace is connected to a cooling unit over 4 tons nominal capacity.

FAQ

What size filter does the Goodman GMS8 use?

Goodman GMS8 filter sizes: 10 x 20, 14 x 20, 14 x 24, 14 x 25, 16 x 25, 20 x 25 and 24 x 24, as listed in the Goodman 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. 10 x 20; 14 x 20; 14 x 24; 14 x 25; 16 x 25; 20 x 25; 24 x 24.

How often should I replace the Goodman GMS8 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.

Does the Goodman GMS8 use more than one filter size?

Yes. The source table lists 7 sizes: 10 x 20, 14 x 20, 14 x 24, 14 x 25, 16 x 25, 20 x 25 and 24 x 24. Which one applies depends on your cabinet and return; check the excerpt (pending human review).

Where does this information come from?

Manufacturer document for Goodman GMS8 (https://cdn.daikincloud.io/PIM/Assets/Documents/SS-GMS8.pdf), last checked 2026-10-27.