Package of two commercial grade 203369 prefilters for F300, F50F, F58F. We measured the size at 12½ x 20 x 5/16. Two of these prefilters are used in the Honeywell 20 x 25 air cleaners.
Only one prefilter is needed for the 20 x 12½ air cleaners.
These prefilters are a genuine product of the Honeywell Commercial Air Products Division. Commercial products have higher standards for design, assembly, procurement, and production.
Prefilter Upgrade Fits the
Permatron polypropylene filters tests shows 43% increase in average arrestance efficiency over metal mesh prefilter. See Poly-203369
F300E1035, F300A2025, F50F1065, F58F1000 F300A2012, F300B2012, F50F1040 and F50F1057 air cleaner.
This 203369 prefilter is for the F300E F300A F50F F58F and will NOT fit
the the F50A or F50E Series. See below for more info.