●Honeywell FC100A1029 16x25x4 Replacement Filter, Minimum Efficiency Reporting Value (MERV) 11 ●High efficiency media filter captures particles as small as 0.3 micron ●Requires no maintenance except periodic (every 6-12 months), super easy, in-and-out media filter replacement. ●Compatibility - Fits all 16x25x4 Honeywell & Aprilaire Space-Gard 2200 models ●Homequip Filter Disposal Bag - Dispose of your old filter properly