Aftermarket Filters for Bionaire Humidifiers BWF100 (3-Pack) Fits Bionaire model BCM6010RC, BCM645, BMC5520, BCM5520RC, BCM5521, BCM4600, BCM5520RCU, BCM6000, BCM6010, BCM7203, BCM7203RC, BCM7204, BCM7305, BCM7204 BCM7305RCB, and BCM-7305RC 3-Pack of Filters Arm & Hammer baking soda enhanced filter naturally deodorizes the air Filter Change indicator changes from purple to red when the filter needs replacing! Measures approximately 5 x 7 1/2 x 1.