Permatron Electrostatic polypropylene prefilter for F300, F50F and F58F series. Independing testing shows 43% increase in average arrestance efficiency over metal mesh prefilter. We measure each filter 12½ x 20 x 1/4.
Designed specifically to spects for the 20" x 25" Honeywell F300 and F50F. The prefilter comes in full 20x25 size or half size of the air cleaner to accomodate tight space such a closet HVAC unit.
This electrostatic prefilter fits the Honeywell F300E1035, F300A2025, F50F1065, F58F1000 F300A2012, F300B2012, F50F1040 and F50F1057 air cleaner.
This poly-203369 prefilter is for series F300E, F300A, F50F F58F and will NOT fit the the F50A or F50E Series.