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The TM9E series 95% gas furnace (Johnson Controls) uses one of 4 filter sizes, depending on cabinet width (or model) and return location: 16x25, 14x25, 20x25, 22x25 (per the York document cited on this page). The page's table shows which size applies to each cabinet and return.
Verified from manufacturer doc Single-stage ECM multi-position furnace
| Airflow / cabinet | Side | Bottom |
|---|---|---|
| 1000 CFM / A | 16 x 25 | 14 x 25 |
| 1200 CFM / A | 16 x 25 | 14 x 25 |
| 1200 CFM / B | 16 x 25 | 16 x 25 |
| 1600 CFM / C | 16 x 25 | 20 x 25 |
| 2000 CFM / C | (2) 16 x 25 | 20 x 25 |
| 2000 CFM / D | (2) 16 x 25 | 22 x 25 |
Sizes are for high-velocity (600 FPM) filters. Filters are field-supplied and must be installed outside the furnace cabinet.
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.
TM9E Installation Manual, Table 3 – Recommended Filter Sizes (High Velocity 600 FPM)
Last checked 2026-10-21. Manufacturers revise documents. If your unit's label disagrees, trust the label.
The TM9E series 95% gas furnace (Johnson Controls) uses one of 4 filter sizes, depending on cabinet width (or model) and return location: 16x25, 14x25, 20x25, 22x25 (per the York document cited on this page). The page's table shows which size applies to each cabinet and return. 1000 CFM / A – 16 x 25 – 14 x 25; 1200 CFM / A – 16 x 25 – 14 x 25; 1200 CFM / B – 16 x 25 – 16 x 25; 1600 CFM / C – 16 x 25 – 20 x 25; 2000 CFM / C – (2) 16 x 25 – 20 x 25; 2000 CFM / D – (2) 16 x 25 – 22 x 25.
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.
TM9E Installation Manual, Table 3 – Recommended Filter Sizes (High Velocity 600 FPM) (https://pimmedia.winsupplyinc.com/pim/INTA/092019/_TM9E100C16MP12_UPGTM9E100C16M_INTA.pdf), last checked 2026-10-21.