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Our script found these filter sizes in the Lennox ML296UHV 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 ML296UHV
Last checked 2026-10-23. Manufacturers revise documents. If your unit's label disagrees, trust the label.
5 - If necessary, run the condensate line into a condensate TABLE 1
pump to meet drain line slope requirements. The
pump must be rated for use with condensing furnaces. Furnace Filter Size
Protect the condensate discharge line from the pump Cabinet Width Side Return Bottom Return
to the outside to avoid freezing.
17-1/2” 16 X 25 X 1 (1) 16 X 25 X 1 (1)
6 - Continue with exhaust, condensate and intake piping
21” 16 X 25 X 1 (1) 20 X 25 X 1 (1)
installation according to instructions.
Return Air -- Horizontal Applications 24-1/2” 16 X 25 X 1 (2) 24 X 25 X 1 (1)
Return air may be brought in only through the end of a Duct System
furnace installed in the horizontal position. The furnace is
equipped with a removable bottom panel to facilitate in- Use industry-approved standards to size and install the
stallation. See FIGURE 15. supply and return air duct system. Refer to ACCA Manual
D. This will result in a quiet and low-static system that has
INTAKE PIPE *GAS CONNECTION uniform air distribution. See below for proper duct instal-
EXHAUST PIPE lation.
*Gas connector may be
SUPPLY
used for Canadian AIR Install self tapping screws
to seal any potential air
able by local authority leaks
having jurisdiction.
SUPPLYOur script found these filter sizes in the Lennox ML296UHV 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 ML296UHV (https://tech.lennoxintl.com/C03e7o14l/VIu12Ch2uV/507869-03a.pdf), last checked 2026-10-23.