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Our script found these filter sizes in the Bryant 987MB source document's filter table: 16x25x3/4, 20x25x3/4, 24x25x3/4. This page is pending human review, so check the source excerpt on the page to see which size applies to your cabinet and return.
Auto-extracted · review pending Filter sizes auto-extracted from the manufacturer document.
| Sizes / part numbers 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.
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 Bryant 987MB
Last checked 2026-10-23. Manufacturers revise documents. If your unit's label disagrees, trust the label.
flanges or air conditioning coil casing (when used). DO NOT cut main installed in the common return duct prior to entering the return air
furnace casing side to attach supply air duct, humidifier, or other opening in any orientation.
accessories. All accessories MUST be connected to duct external to FILTER SIZE
FURNACE
furnace main casing. CASING SIDE BOTTOM FILTER TYPE
Return Air Connections WIDTH RETURN RETURN
The return-air duct may be connected to bottom of the furnace. The side 17-1/2 (445)
16 x 25 x 3/4 16 x 25 x 3/4
Washable*
(406 x 635 x 19) (406 x 635 x 19)
of casing that faces downward may also be used for return air
16 x 25 x 3/4 20 x 25 x 3/4
connection. A combination of the bottom and downward facing side may 21 (533) (406 x 635 x 19) (508 x 635 x 19) Washable*
also be used. The upward facing side of the casing cannot be used as a 16 x 25 x 3/4 24 x 25 x 3/4
24-1/2 (622) (406 x 635 x 19) (610 x 635 x 19) Washable*
return air connection, see Fig. 22.
Bottom Return Air Inlet *. Recommended to maintain air filter face velocity. See Product Data for part
number.
These furnaces are shipped with bottom closure panel installed in bottom
return-air opening. Remove this panel when bottom return air is used. Our script found these filter sizes in the Bryant 987MB source document's filter table: 16x25x3/4, 20x25x3/4, 24x25x3/4. This page is pending human review, so check the source excerpt on the page to see which size applies to your cabinet and return. 16 x 25 x 3/4; 20 x 25 x 3/4; 24 x 25 x 3/4.
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.
Manufacturer document for Bryant 987MB (https://www.shareddocs.com/hvac/docs/1009/Public/0E/II987MB-02.pdf), last checked 2026-10-23.