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Payne PG9MAB furnace: filter size

Payne PG9MAB filter sizes: 16 x 25 x 3/4, 20 x 25 x 3/4 and 24 x 25 x 3/4, as listed in the Payne 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
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.

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 Payne PG9MAB
Last checked 2026-11-05. Manufacturers revise documents. If your unit's label disagrees, trust the label.

Excerpt from the source

                     Table 4 – Filter Information
        AIR FILTER LOCATED IN BLOWER COMPARTMENT
 FURNACE              FILTER SIZE --- IN (mm)
  CASING                                              FILTER
   WIDTH                                               TYPE
  IN (mm)        Side Return†*         Bottom Return*
   17–1/2          (1) 16 X 25 X 3/4       (1) 16 X 25 X 3/4     Washable
    (445)          (406 X 635 X 19)        (406 X 635 X 19)
   21 (533)        (1) 16 X 25 X 3/4       1) 20 X 25 X 3/4      Washable
                   (406 X 635 X 19)        (508 X 635 X 19)
   24–1/2        (1 or 2)16 X 25 X 3/4     (1) 24 X 25 X 3/4     Washable
    (622)          (406 X 635 X 19)        (610 X 635 X 19)
*Alternate sizes and additional filters can be ordered from your distributor or
dealer.
†Upflow only. Alternate sizes and additional filters may be ordered from
your dealer.
                 !         WARNING
  FIRE HAZARD
  A failure to follow this warning could result in fire, personal                                                                                A08604
  injury, or death.                                                                             Fig. 26 -- Filter Installed for Side Inlet
  Never connect return-air ducts to the back of the furnace.
  Return-air duct connections on furnace side(s) permitted in

FAQ

What size filter does the Payne PG9MAB use?

Payne PG9MAB filter sizes: 16 x 25 x 3/4, 20 x 25 x 3/4 and 24 x 25 x 3/4, as listed in the Payne 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; 24 x 25 x 3/4.

How often should I replace the Payne PG9MAB 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 Payne PG9MAB filter?

Every size found in the source table is 3/4 in. thick: 16 x 25 x 3/4, 20 x 25 x 3/4 and 24 x 25 x 3/4. Pending human review; check the excerpt.

Where does this information come from?

Manufacturer document for Payne PG9MAB (https://www.shareddocs.com/hvac/docs/1009/Public/0D/IM-PG9MAB-05.pdf), last checked 2026-11-05.