Package of two residential grade 203370 prefilters for F300 or F50F. We measured the size of each prefilter at 10 x 20 x 5/16. Two of these prefilters are used in the Honeywell 20 x 20 air cleaners. Honeywell packages 2 prefilters per box. These prefilters are a genuine Honeywell residential product.
Prefilters generally do not wear out. Often replacement is needed because over time the woven aluminum foil corrodes and pieces flake off.
Fits the F300E1027, F300A2020 and F50F1032 air cleaner.
This 203370 prefilter is for the F300E F300A F50F Series and will NOT fit the the F50A or F50E Series. See below for more info.