Ruud R951V ULN furnace filter sizes

R951V ULN furnaces take 14 x 20 or 15.75 x 25 or 19.25 x 25 filters, depending on cabinet width and return.

Pick your full model number below for the exact size.

A 15.75 x 25 filter (bottom (RXGF-CB external rack, upflow/horizontal) return) or a 15.75 x 25 filter (side (RXGF-CD external side-return rack, upflow)) or a 14 x 20 filter (downflow top (RXGF-CC external rack) return)

R951V0403A17M4UCAP R951V0603A17M4UCAP

A 19.25 x 25 filter (bottom (RXGF-CB external rack, upflow/horizontal) return) or a 15.75 x 25 filter (side (RXGF-CD external side-return rack, upflow)) or a 14 x 20 filter (downflow top (RXGF-CC external rack) return)

R951V0705A21M4UCAP R951V1005A21M4UCAP

Source

Rheem R951V Ultra Low NOx spec sheet, Form G11-675 Rev. 3 (spec sheet, page 8): document. Read 2026-11-03.
Ruud R951V Ultra Low NOx spec sheet, Form G22-675 Rev. 3 (spec sheet, page 8): document. Read 2026-11-03.