Home › Furnace filters › EL195UH
Lennox EL195UH filter sizes: 16 x 25 x 1, 20 x 25 x 1 and 24 x 25 x 1, as listed in the Lennox 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:
| Sizes 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 EL195UH
Last checked 2026-11-04. Manufacturers revise documents. If your unit's label disagrees, trust the label.
This unit is not equipped with a filter or rack. A field−pro- bottom of the furnace and the platform to ensure that the
vided high velocity rated filter is required for the unit to oper- unit operates properly and safely. Use fiberglass sealing
ate properly. Table 1 lists recommended filter sizes. strips, caulking, or equivalent sealing method between the
A filter must be in place whenever the unit is operating. plenum and the furnace cabinet to ensure a tight seal. If a
TABLE 1 filter is installed, size the return air duct to fit the filter frame.
Furnace Filter Size
Cabinet Width
Pipe & Fittings Specifications
Side Return Bottom Return
17−1/2" 16 X 25 X 1 (1) 16 X 25 X 1 (1) All pipe, fittings, primer and solvent cement must conform
21" 16 X 25 X 1 (1) 20 X 25 X 1 (1)
with American National Standard Institute and the Ameri-
can Society for Testing and Materials (ANSI/ASTM) stan-
24−1/2" 16 X 25 X 1 (2) 24 X 25 X 1 (1)
dards. The solvent shall be free flowing and contain no
lumps, undissolved particles or any foreign matter that ad-
Duct System versely affects the joint strength or chemical resistance of
Use industry-approved standards to size and install the the cement. The cement shall show no gelation, stratifica-
supply and return air duct system. Refer to ACCA Manual tion, or separation that cannot be removed by stirring. Re-
D. This will result in a quiet and low-static system that has fer to the table 2 below for approved piping and fitting ma-
uniform air distribution. terials.Lennox EL195UH filter sizes: 16 x 25 x 1, 20 x 25 x 1 and 24 x 25 x 1, as listed in the Lennox 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 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.
Every size found in the source table is 1 in. thick: 16 x 25 x 1, 20 x 25 x 1 and 24 x 25 x 1. Pending human review; check the excerpt.
Manufacturer document for Lennox EL195UH (https://www.lennox.com/dA/7c0575dc21/Lennox_EL195UH_IOM.pdf), last checked 2026-11-04.