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Our script found these filter sizes in the Trane S8V2 source document's filter table: 14x25x1, 16x25x1, 20x25x1, 24x25x1. 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 found in the source table |
|---|
| 14 x 25 x 1 |
| 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.
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 Trane S8V2
Last checked 2026-10-25. Manufacturers revise documents. If your unit's label disagrees, trust the label.
Return Air Filters
Typical Air Filter Installations
Filters are not factory supplied for furnaces. Filter size
*
needed will be dependent on type of filter and CFM
requirement. Filters must be installed externally to the unit. LOCATING
NOTCHES
Important: It is recommended to transition return ducting to PROVIDED
the same size as the opening. It is acceptable FOR SIDE *
RETURN
for return duct or filter frame to extend forward CUTOUT
of the opening but plastic plugs must be
installed in any opening that the duct or filter
frame may cover.
Table 30. Return air filters *
Furnace Width (in.) Filter Qty and Size (in.) *
FRONT OF
14–1/2 1 — 14 x 25 x 1 FURNACE
17–1/2 1 — 16 x 25 x 1 Note: See dimensional data drawing.
21 1 — 20 x 25 x 1
24–1/2 1 — 24 x 25 x 1 Return air filters for furnace in horizontal
Note: For upflow airflow furnaces where the airflow requirement exceeds
configuration
1600 CFM - Furnaces will require return air openings and filters on:
When the furnace is installed in the horizontalOur script found these filter sizes in the Trane S8V2 source document's filter table: 14x25x1, 16x25x1, 20x25x1, 24x25x1. This page is pending human review, so check the source excerpt on the page to see which size applies to your cabinet and return. 14 x 25 x 1; 16 x 25 x 1; 20 x 25 x 1; 24 x 25 x 1.
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 Trane S8V2 (https://elibrary.tranetechnologies.com/public/residential-hvac/Literature/Installation%20Operation%20and%20Maintenance/FNR-SVX003A-EN_10312025.pdf), last checked 2026-10-25.