4 Pack of Premium Humidifier Filters Compatible with Humidifier Filters HAC-504, HAC-504AW & Filter A | Replacement for HCM 350 Filters & Cool Mist Humidifiers

Upgraded Blue Filters - Our upgraded filters compatible with HCM350W filter feature a blue pre-filter to catch large particles before they enter your air, for even higher air quality Rigid Construction To Reduce Sagging - Our replacements for humidifiers filter, humidifiers filters and cool humidifier filter are constructed with rigid absorbent paper to improve our filter's structure once wet and reduce sagging Compatible With Humidifier Filter Model HCM350W & More - Fits HCM350W, HCM-350, HCM350, HCM-350B, HCM350B, HCM-350W, HCM-350B-CST, HCM-300, HCM300, HCM-300T, HCM300T, HCM-305T, HCM305T, HCM-310T, HCM310T, HCM-315T, HCM315T, HCM305BCST, HCM-450B-CST, HCM450BCST, HCM-500, HCM500, HCM-530, HCM530, HCM-535, HCM353, HCM-535-20, HCM53520, HCM-540, HCM540, HCM-550, HCM550, HCM-550-19, HCM55019, HCM-551, HCM551, HCM-560, HCM560, HCM-600, HCM600, HCM-630, HCM630, HCM-631, HCM631