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View Full Version : What size air filter do I need for a Rheem rbea-21 model

barbe80
Mar 30, 2014, 08:29 AM
What size filtr do I need for a Rheem RBEA- 21 model
ma0641
Mar 30, 2014, 09:28 AM
It should be marked on the inside of the air handler or measure the old filter or filter opening.