The Honeywell F90A Replacement Washable Prefilter was specifically designed to be compatible with the F90A Series. Save yourself the hassle and expense of purchasing additional filters with Honeywell's solution of washable filters. Once your filter has accumulated a sizable amount of dust, pollen and various other airborne hazards, you now have the option of simply washing your filter instead of discarding it and replacing it with another. These filters were created with longevity in mind and will assist you in saving time, money and any additional effort. The F90A Series requires 2 pre-filters.
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