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Ruud R801T UH furnace filter sizes

R801T UH furnaces take 12.25 x 25 or 15.75 x 25 or 19.25 x 25 or 22.75 x 25 filters, depending on cabinet width and return.

Pick your full model number below for the exact size.

A 12.25 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))

R801T0503A14UHNNAS R801T0503A14UHSNAS

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))

R801T0754A17UHNNAS R801T0754A17UHSNAS

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))

R801T1005A21UHNNAS R801T1005A21UHSNAS

A 22.75 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))

R801T1255A24UHNNAS R801T1255A24UHSNAS

Source

Rheem Endeavor Line SEER2 furnace brochure + spec sheet bundle (Form M11-6115/M11-6116 with G11-662..G11-678) (spec sheet (bundle of maker spec sheets), page 17): document. Read 2026-11-03.
Ruud R801T UH Endeavor Line Achiever Series spec sheet, Form G22-662 Rev. 7 (2026) (spec sheet, page 9): document. Read 2026-11-03.