Philanthro PHIL20255M11 - (2-Pack) 20" x 25" x 5" Air Filter, MERV 11

Nominal Filter Size: 20 x 25 x 5 Actual Filter Size: 19.75" x 24.81" x 4.38" Direct Replacement for Honeywell FC100A1037 Recommend Filter Replacement: Every 6 months