<br> <b>Removes most pollutants as small as 0.3 microns</b>- create a fresh environment.<br><b>Optimized Filter Design</b> - improves filter effect and maximize the moisture output evenly.<br><b>Durable Filter Material</b> - Maintain high-quality filtration effect for a long time.<br><br> <b>4 pack humidifier filter replacement Honeywell Filter</b><br><br> <b>Fits for following filters and humidifier models：</b><br><br> <b>HAC-504AW，HAC-504，HAC504V1 ，Filter A</b><br><br> <b>HCM-300 Series: </b><br>HCM-300T, HCM-305T, HCM-305T-CST, HCM-310T, HCM-315T, HCM-350, HCM-350B, HCM-350B-CST, HCM-350W；<br><b>HCM-500 Series: </b><br>HCM-530, HCM-535, HCM-535-20, HCM-540, HCM-550, HCM-550-19, HCM-560, Environizer HCM-551, Environizer 63-1508；<br> <b>HCM-600 Series: </b><br>HCM-630, HCM-631, HCM-632, HCM-632TG, HCM-635, HCM-640BW, HCM-645, HCM-646, HCM-650；<br><b>HCM-700 Series: </b><br>HCM-710；<br> <b>HCM-1000 Series: </b><br>HCM-1000, HCM-1000C, HCM-1010；<br><b>HCM-2000 Series: </b><br>HCM-2000, HCM-2000C, HCM-2001, HCM-2002, HCM-2020, HCM-2050, HCM-2051, HCM-2052；<br><b>HEV-300 Series:</b><br> HEV-312, HEV-355；<br><b>Enviracaire Humidifier: </b>ECM-250i；<br><b>Kaz Humidifier: </b>3020；<br><b>Robitussin Humidifier:</b> DH-835；<br><b>Vicks Humidifiers: </b>V3100, V3500, V3600.<br><b>Tip:</b><br>To maintain maximum filtering performance, filter should be replaced about every 1-2 months(Depending on use and local water quality)or when performance starts to deteriorate.<br><br>While it is not a Honeywell OEM replacement，it can bring you a wonderful experience.We offer truly worry-free 90 days warranty and friendly customer service.Please contact us if you have any problem about this replacement.