Pair of Permatron 203371 hospital grade prefilters for the F50A or F50E. 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 15¾ x 5/16. A pair of these prefilters are used in the Honeywell 16 x 25" air cleaners. These prefilters are for the F50A or F50E series and NOT for the F50F Series.
These prefilters fit models:
F50E1018 F50E1174 F50A1017
F50E1034 F50E1281 F50A1033
|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.