Pair of Permatron 203369 hospital grade prefilters for the F50F or F300. Permatron, the premiere prefilter manufacturer, designed these prefilters to Honeywell specs. The metal mesh consists of 5 layers of slit and expanded aluminum of differing densities. The frame is upgraded to stainless steel.
Size 12½ x 20 x 5/16. A pair of these prefilters are used in the Honeywell 20 x 25" air cleaners. These prefiters are for the F300 and F50F and NOT for the F50A F50E Series.
These prefilters fit models:
F300E1035 F50F1065 F58F1000
|Permatron's Super Premium prefilters have a stainless steel frame. Its a heavy weight USA made aluminum mesh. |
|The Honeywell aluminum frames are weaken by corrosion from electrolysis and ozone. Humidifier moisture can contain corrosives chlorine and salt. |
|The mesh can easily pull out of the aluminum frame. The stainless frame holds the mesh like a spring clamp. |