Honeywell 198571
Honeywell Prefilter Commercial Grade F57B 21-3/8 x 11-3/4
Price:$39.00
Honeywell 198571 prefilter for the ceiling mount F57B. Measures 21-3/8 x 11-3/4 x 7/8.

Note install this filter with the correct air flow direction. This filter has an arrow stampped in to the aluminum showing air flow direction.
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