Upgraded Blue Pre-Filter Catches Large Particles<br> <br>These upgraded humidifier filters offer a second layer of filtering to catch large particles before they enter your air<br> <br>Perfect Replacement for Honeywell HAC-504, HAC-504AW & HAC-501V1 Filters<br> <br>Made from high-quality, durable material, these upgraded filters are compatible with the below Honeywell humidifier models:<br> <br>HCM-300 Series: HCM-300T, HCM-305T, HCM-310T, HCM-315T, HCM-350, HCM-350B, HCM-350W HCM-450BCST<br> <br>HCM-500 Series: HCM-530, HCM-535, HCM-535-20, HCM-540, HCM-550, HCM-550-19, HCM-551, HCM-560<br> <br>HCM-600 Series: HCM-630, HCM-631, HCM-632, HCM-632TG, HCM-635, HCM-640BW, HCM-645, HCM-646, HCM-650<br> <br>HCM-700 Series: HCM-710<br> <br>HCM-1000 Series: HCM-1000, HCM-1000C, HCM-1010<br> <br>HCM-2000 Series: HCM-2000C, HCM-2001, HCM-2002, HCM-2020, HCM-2050, HCM-2051, HCM2052, HEV-312, HEV-355<br> <br>Enviracaire Series: ECM-250i<br> <br>Rigid Construction Reduces Sagging<br> <br>Rigid absorbent paper reduces sagging once wet while maximizing your Honeywell's moisure output<br> <br>Tips for Daily Use<br> <br>For best results, flip filter daily and use distilled water<br> <br>Soak in cool water before replacing to ensure uninterrupted moisture output<br> <br>Package Contents<br> <br>4 premium humidifier filters<br> <br>This is not a Honeywell OEM product. The Honeywell and Enviracaire brand names and logos are the registered trademarks of their respective owners. Any use of the Honeywell and Enviracaire brand names or model designations for this product are made solely for purposes of demonstrating compatibility. Packaging may vary, performance does not.<br> <br>