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The Honeywell 203373 is the correct replacement pre-filter for the following air cleaner models:
The Honeywell 203373 Electronic Pre-Filter - 20x20 is a replacement pre-filter for 20" x 20" Honeywell model F50A or F50E air cleaner models. This electronic air cleaner pre-filter measures 10" x 19" x 3/4" and helps capture larger particulates in your air.
Honeywell 203373 Electronic Pre-Filter - 20x20 specifications: