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York YP9C furnace: filter size

The York YP9C furnace uses a 16 x 25, 20 x 25 or 22 x 25 filter, depending on cabinet width (or model) and return location (per the York document cited on this page). The table below shows which size applies to each cabinet and return.

Verified from manufacturer doc Filter sizes hand-checked against the manufacturer document

Last checked against the manufacturer document:

Filter sizes by cabinet / model

Airflow (CFM) / cabinetSide returnBottom return
1200 CFM, B cabinet16 x 2516 x 25
1600 CFM, C cabinet16 x 2520 x 25
2000 CFM, C cabinet(2) 16 x 2520 x 25
2000 CFM, D cabinet(2) 16 x 2522 x 25

York lists face size only (no thickness). Air velocity through throwaway filters may not exceed 300 ft/min; above that, use high-velocity filters. Do not exceed 1800 CFM with a single side return and a 16 x 25 filter.

Measuring a furnace air filter's edge with a tape measure
Illustration only. Not this manufacturer's part.

Replacement interval

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.

Before you buy

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.

MERV notes

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.

Related models

Where this data came from

YP9C Installation Manual, Table 3 – Recommended Filter Sizes (High Velocity 600 FPM)
Last checked 2026-10-26. Manufacturers revise documents. If your unit's label disagrees, trust the label.

FAQ

What size filter does the York YP9C furnace use?

The York YP9C furnace uses a 16 x 25, 20 x 25 or 22 x 25 filter, depending on cabinet width (or model) and return location (per the York document cited on this page). The table below shows which size applies to each cabinet and return. 1200 CFM, B cabinet – 16 x 25 – 16 x 25; 1600 CFM, C cabinet – 16 x 25 – 20 x 25; 2000 CFM, C cabinet – (2) 16 x 25 – 20 x 25; 2000 CFM, D cabinet – (2) 16 x 25 – 22 x 25.

How often should I replace the York YP9C furnace filter?

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.

Why doesn't my filter measure exactly 16 x 25?

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.

What is the York YP9C furnace side return filter size?

Side return filter size by airflow (cfm) / cabinet: 1200 CFM, B cabinet: 16 x 25; 1600 CFM, C cabinet: 16 x 25; 2000 CFM, C cabinet: (2) 16 x 25; 2000 CFM, D cabinet: (2) 16 x 25 (per the source table).

What is the York YP9C furnace bottom return filter size?

Bottom return filter size by airflow (cfm) / cabinet: 1200 CFM, B cabinet: 16 x 25; 1600 CFM, C cabinet: 20 x 25; 2000 CFM, C cabinet: 20 x 25; 2000 CFM, D cabinet: 22 x 25 (per the source table).

Where does this information come from?

YP9C Installation Manual, Table 3 – Recommended Filter Sizes (High Velocity 600 FPM) (https://www.yorknow.com/pub/media/documentation/yp9c_installguide.pdf), last checked 2026-10-26.