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The GeneralAire Air Cleaner Prefilter R2-0855 is the correct replacement prefilter for the following model of air cleaner:
This GeneralAire air cleaner prefilter measures 20" x 10" 1/2". The GeneralAire R2-0855 is also known as GeneralAire model no. EAC22-13, and GeneralAire part no. 4782.