For HUMIDIFIER FILTER "C": 4 Pack Absorbent Humidifier Filters Compatible with HWF65, HWF65PDQ-U - Filter C. Humidifier replacement filters are compatible with , Sunbe.am and Bio.naire humidifiers. IMPROVES HUMIDIFIER EFFICIENCY: Type C filter. Extended filter life due to reinforced outer layer. Suitable for Modols: HM1888, HM1889, HM2059, HM3000, HM3800, HM3850, HM4000, HM1855, HM1865, HM1850, HM1851, HM1845, HM1840, HM1895, HM2060W, SCM1866, SCM1895, SCM1896 HIGH EFFICIENCY: It has high absorption efficiency and good air permeability, which can quickly humidify the air. It captures hard water minerals to stop white dust and features an outer layer of activated carbon to combat odors ECONOMICAL: We understand that using evaporative humidifiers is expensive and requires frequent maintenance. With this, we make sure to provide MORE for LESS! Humidifier filter set includes 4 replacement wick filters that allow for more frequent changes. The more often the filter is replaced, the cleaner