RunTru by Trane A801X furnace filter sizes
A801X furnaces take 14 x 25 x 1 or 16 x 25 x 1 or 20 x 25 x 1 or 24 x 25 x 1 filters, depending on cabinet width and return.
Pick your full model number below for the exact size.
A 14 x 25 x 1 filter (single/any (multiposition; spec table) return) or a 14 x 25 x 1 filter (single/any (return opening; external))
A 16 x 25 x 1 filter (single/any (multiposition; spec table) return) or a 16 x 25 x 1 filter (single/any (return opening; external))
A 20 x 25 x 1 filter (single/any (multiposition; spec table) return) or a 20 x 25 x 1 filter (single/any (return opening; external))
A 24 x 25 x 1 filter (single/any (multiposition; spec table) return) or a 24 x 25 x 1 filter (single/any (return opening; external))