Package of two commercial grade 209989 prefilters for F300 or F50F. We measured the size at 10 x 16 x 3/8. Two of these prefilters are used in the Honeywell 16 x 20 air cleaners. Honeywell packages 2 prefilters per box.
Prefilters generally do not wear out. Often replacement is needed because over time the woven aluminum foil corrodes and pieces flake off.
Prefilter Upgrade Fits
Permatron polypropylene filters tests shows 43% increase in average arrestance efficiency over metal mesh prefilter. See Poly-209989
the F300E1001, F300A1620 and F50F1149 air cleaner.
This 209989 prefilter is for the F300E F300A F50F and will NOT fit
the the F50A or F50E Series. Read below for more info.