Home › Furnace filters › 58CTW / 58CTY
Carrier 58CTW / 58CTY filter sizes: 14 x 25 x 3/4, 16 x 25 x 3/4, 20 x 25 x 3/4 and 24 x 25 x 3/4, as listed in the Carrier 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 |
|---|
| 14 x 25 x 3/4 |
| 16 x 25 x 3/4 |
| 20 x 25 x 3/4 |
| 24 x 25 x 3/4 |
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 Carrier 58CTW / 58CTY
Last checked 2026-11-05. Manufacturers revise documents. If your unit's label disagrees, trust the label.
47
Table 13 – Filter Size Information -- In. (mm)
FILTER SIZE
FURNACE CASING WIDTH SIDE BOTTOM FILTER TYPE
RETURN RETURN
16 X 25 X 3/4 14 X 25 X 3/4
14 ---1/2 (368) Washable*
(406 X 635 X 19) (356 X 635 X 19)
16 X 25 X 3/4 16 X 25 X 3/4
17 ---1/2 (445) Washable*
(406 X 635 X 19) (406 X 635 X 19)
16 X 25 X 3/4 20 X 25 X 3/4
21 (533) Washable*
(406 X 635 X 19) (508 X 635 X 19)
16 X 25 X 3/4 24 X 25 X 3/4
24 (610) Washable*
(406 X 635 X 19) (610 X 635 X 19)
* Recommended
The inducer and blower motors are pre--lubricated and require no 15. Reconnect blower leads to furnace control. Refer to fur-
additional lubrication. These motors can be identified by the nace wiring diagram, and connect thermostat leads if pre-
absence of oil ports on each end of the motor. viously disconnected.
Clean blower motor and wheel as follows: 16. To check blower for proper rotation:
1. Turn off electrical supply to furnace. a. Turn on electrical supply.
2. Remove outer door.
3. For downflow or horizontal furnaces having vent pipesCarrier 58CTW / 58CTY filter sizes: 14 x 25 x 3/4, 16 x 25 x 3/4, 20 x 25 x 3/4 and 24 x 25 x 3/4, as listed in the Carrier 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. 14 x 25 x 3/4; 16 x 25 x 3/4; 20 x 25 x 3/4; 24 x 25 x 3/4.
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 3/4 in. thick: 14 x 25 x 3/4, 16 x 25 x 3/4, 20 x 25 x 3/4 and 24 x 25 x 3/4. Pending human review; check the excerpt.
Manufacturer document for Carrier 58CTW / 58CTY (https://www.shareddocs.com/hvac/docs/1009/Public/07/58CTW-04SI.pdf), last checked 2026-11-05.