Ruud R801VA ULN (UF/HZ) furnace filter sizes

R801VA ULN (UF/HZ) furnaces take 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))

R801VA050417MUA R801VA070417MUA

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))

R801VA100521MUA

Source

Ruud R801V (UF/HZ) Ultra Low NOx Series spec sheet, Form G22-560 Rev. 1 (spec sheet, page 9): document. Read 2026-11-03.
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 53): document. Read 2026-11-03.