Accumulair Humidifier Wick Filter for HWF65 Bionaire (Aftermarket) Fits Bionaire models BCM1845, BCM1845C, BCM1850 and BCM1855 Bionaire humidifier wick replacement filters. Measures approximately 7 1/2" H x 5 1/4" ID x 7 1/4" OD x 1" Thick. With antimicrobial agent! This is an aftermarket filter.