Humidifier Wick Filter Bionaire WF2630 (Aftermarket) Fits Bionaire models BCM4505&#44; BCM4509&#44; BCM4510&#44; and BCM4530. 4 filters per box. Measures approximately 6 1/2 x 8 1/2 x 2. Honeycomb filtration to trap mineral pollutants found in water and help prevent them from entering your For optimum performance&#44; replace filters twice a season.