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

4 Piece Value Pack - 4 filters compatible with Honeywell replacement wicking Filter A for your Honeywell HAC-504, HAC-504AW, and HAC-504V1 humidifier filters. Made from high-quality, durable material with an optimized filter design to maximize your compatible Honeywell HCM 350 filter moisture output

Upgraded Blue Filters - Our upgraded filters compatible with Honeywell 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 Honeywell humidifiers filter, Honeywell humidifiers filters and Honeywell cool humidifier filter are constructed with rigid absorbent paper to improve our filter's structure once wet and reduce sagging

Compatible With Honeywell 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

Usage Tips - For best results, flip your compatible Honeywell humidifier filter HAC 504 replacement daily and only fill humidifier tank with distilled water. Hard water degrades ALL compatible Honeywell humidifier filters and yellows them prematurely. Soak in cool water before replacing to ensure uninterrupted moisture output.