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Our script found these filter sizes in the Lennox EL296UHV source document's filter table: 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 / part numbers found in the source table |
|---|
| 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 Lennox EL296UHV
Last checked 2026-10-23. Manufacturers revise documents. If your unit's label disagrees, trust the label.
TABLE 1
Return air can be brought in through the bottom or either
Furnace Filter Size side of the furnace (return air brought into either side of
Cabinet Width Side Return Bottom Return furnace allowed only in upflow applications). If a furnace
17-1/2” 16 X 25 X 1 (1) 16 X 25 X 1 (1) with bottom return air is installed on a platform, make an
airtight seal between the bottom of the furnace and the
21” 16 X 25 X 1 (1) 20 X 25 X 1 (1) platform to ensure that the unit operates properly and
24-1/2” 16 X 25 X 1 (2) 24 X 25 X 1 (1) safely. Use fiberglass sealing strips, caulking, or equiva-
lent sealing method between the plenum and the furnace
cabinet to ensure a tight seal. If a filter is installed, size the
return air duct to fit the filter frame.
Page 13
Pipe & Fittings Specifications
All pipe, fittings, primer and solvent cement must conform
CAUTION
with American National Standard Institute and the Ameri- Solvent cements for plastic pipe are flammable liquids
can Society for Testing and Materials (ANSI/ASTM) stan- and should be kept away from all sources of ignition.
dards. The solvent shall be free flowing and contain no Do not use excessive amounts of solvent cement when
lumps, undissolved particles or any foreign matter that ad- making joints. Good ventilation should be maintained to
versely affects the joint strength or chemical resistance of reduce fire hazard and to minimize breathing of solvent
the cement. The cement shall show no gelation, stratifica- vapors. Avoid contact of cement with skin and eyes.
tion, or separation that cannot be removed by stirring. Re-Our script found these filter sizes in the Lennox EL296UHV source document's filter table: 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. 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 Lennox EL296UHV (https://www.lennox.com/dA/795a74684b/508247-01a.pdf), last checked 2026-10-23.