4-Pack Humidifier Wick Filter for Holmes Bionaire 900 / 900CS / 900X / Replacement

® 4-pack Humidifier Wick Filter Replacement; Traps impurities in the water; Dimensions approximately: 8 7/8 inches x 7 1/2 inches x 2 3/8 inches; Replaces Holmes Bionaire part 900 / 900CS / 900X Humidifier Filter; Replace your filter every 2 - 3 months (depending on use and local water quality); 2 weeks replacement warranty!