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