Question:
What are the filter sizes on the Rheem Classic 90 Plus?

Answer:
The filter you need depends on both your furnace configuration (upflow, downflow or horizontal) and the width of your furnace’s cabinet. See the chart below.

Furnace Filters for the Rheem Classic 90 Plus

Air Flow ConfigurationCabinet WidthFilter Size(s)
Upflow17.5″Two 15.75x25x1s
Downflow / Horizontal17.5″Two 12x20x1s
Upflow21″15.75x25x1
Downflow / Horizontal21″Two 12x20x1s
Upflow24.5″15.75x25x1
22.75x25x1
Downflow / Horizontal24.5″

Two 14x20x1

Upflow25″19.25x25x1

Question:
What kind of filter do I need for the Rheem Criterion II Plus 2 LXE furnace?

Furnace Filters for the Rheem Criterion II Plus 2 LXE

Air Flow ConfigurationCabinet WidthFilter Size(s)
All17.5″Two 12x16x1s
All21″Two 20x16x1s
All24.5″ Two 24x16x1s

Question:
Rheem model RGPH-12earjr filter size

Answer:
For your Rheem RGPH filter you need to know your air flow configuration and the width of the front of the furnace cabinet. See the chart below with this information to find the correct filter size you need.

Furnace Filters for the Rheem RGPH

Air Flow ConfigurationCabinet WidthFilter Size(s)
Upflow14″12.25x25x1 (bottom)
15.75x25x1 (side)
Downflow14″ 14x20x1
Upflow17.5″15.75x25x1 (bottom)
15.75x25x1 (side)
Downflow17.5″12x20x1
Upflow21″15.75x25x1(side)
19.25x25x1 (bottom)
Downflow21″Two 12x20x1s
Upflow24.5″15.75x25x1 (bottom)
22.75x25x1 (bottom)
Downflow24.5″

Two 14x20x1s

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