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 WidthFilters
Upflow17-1/2″2 15-3/4x25x1
filters
Downflow / Horizontal17-1/2″2 12x20x1
filters
Upflow21″1 15-3/4x25x1
filter
Downflow / Horizontal21″2 12x20x1
filters
Upflow24-1/2″1 15-3/4x25x1
filter
1 22-3/4x25x1
filter
Downflow / Horizontal24-1/2″

2 14x20x1
filters

Upflow25″1 19-1/4x25x1
filter

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 WidthFilters
All17-1/2″2 12x16x1
filters
All21″2 20x16x1
filters
All24-1/2″

2 24x16x1
filters

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 WidthFilters
Upflow14″1 12-1/4x25x1
filter

 

(bottom air return)
1 15-3/4x25x1
filter

(side air return)

Downflow14″

1 14x20x1
filter

Upflow17-1/2″1 15-3/4x25x1
filter

 

(bottom air return)
1 15-3/4x25x1
filter

(side air return)

Downflow17-1/2″1 12x20x1
filter
Upflow21″1 15-3/4x25x1
filter

 

(side air return)
1 19-1/4x25x1
filter

(bottom air return)

Downflow21″2 12x20x1
filters
Upflow24-1/2″1 15-3/4x25x1
filter

 

(bottom air return)
1 22-3/4x25x1
filter

(bottom air return)

Downflow24-1/2″

2 14x20x1
filters

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