Honeywell FC100A1011 - 20x20x4 Reusable Filter Frame Kit - Includes Lifetime Reusable Frame MODEL # RFFS 885 and 6 Replacement Filters PART # PP-885 MERV 11. Made by FurnaceFilters.CaReplaces Honeywell FC100A1011, 20x20x4 filters Actual Size : 19 15 16" x 19 3 4" x 4 3 8" Replacement Pleat Packs PART # PP 885 MERV 11 is for use with Model # RFFS 873 Reusable Filter Frame System is Listed Below Kit Includes Lifetime Reusable Frame MODEL # RFFS 885 and 6 Replacement Filters PART # PP 885 MERV 11. One Replacement Filter lasts Up to 6 Months. Reusable Frame System saves up to 90% of Storage Space and up to 90% Volume of Materials