GeneralAire 4541 / 4511 16x25x5 Reusable Filter Frame Kit - Includes Lifetime Reusable Frame MODEL # RFFS 841 and 6 Replacement Filters PART # PP-841 MERV 11. Made by FurnaceFilters.CaReplaces GeneralAire 4541 4511 16x25x5 Furnace Filter Actual Size : 15 5 8" x 24 3 16" x 4 15 16" Replacement Pleat Packs PART # PP 841 MERV 11 is for use with Model # RFFS 841 Reusable Filter Frame System is Listed Below. Kit Includes Lifetime Reusable Frame MODEL # RFFS 841 and 6 Replacement Filters PART # PP 841 MERV 11 (One Installed and 2 extras) One Replacement Filter lasts Up to 6 Months. Reusable Frame System saves up to 90% of Storage Space