Resideo Honeywell Air Cleaner Pre-Filter, 12-1/2" x 19-3/4" x 5/16", for F50A and F50EResideo Honeywell Air Cleaner Pre Filter, 12 1 2" x 19 3 4" x 5 16", for F50A and F50E Resideo Honeywell Air Cleaner Pre Filter. This pre filter is 12 1 2" x 19 3 4" x 5 16". This filter does not include the clips. This filter is sold individually. For use with models F50A1009, F50A1025, F50E1000, F50E1026, F50E1141, F50E1166, F50E1273, F50E1299, F50A series and F50E series. This filter will not fit F50F or F300 models. This electronic air cleaner pre