FILTER DESIGN FIT FOR: HCM-300 Series: HCM-300T, HCM-305T, HCM-310T, HCM-315T, HCM-350, HCM-350B, HCM-350W, HCM-450BCST, HCM-500 Series: HCM-530, HCM-535, HCM-535-20, HCM-540, HCM-550, HCM-550-19, HCM-551, HCM-560. HCM-600 Series: HCM-630, HCM-631, HCM-632, HCM-632TG, HCM-635, HCM-640BW, HCM-645, HCM-646, HCM-650, HCM-700 Series: HCM-710, HCM-1000 Series: HCM-1000, HCM-1000C, HCM-1010, HCM-2000 Series: HCM-2000C, HCM-2001, HCM-2002, HCM-2020, HCM-2050, HCM-2051, HCM2052, HEV-312, HEV-355.HIGH QUALITY: Made of environmentally friendly professional import filter to ensure optimal performance and a healthy lifestyle. Honeycomb pad design, allows for maximum absorption of water for moisture output.EXCELLENT PERFORMANCE: This humidifier filter captures minerals and pollutants from the water and helps prevent white dust. Premium humidifier wicking filter to create a fresh indoor environment, bring you multiple protection and family health escort.KEEP YOU HEALTHY: For best performance, recommended filter replacement interval of 1-2 months. Regularly replace filter to keep air moist and make the air feel warmer can help reduce nasal congestion and improve your breathing comfort, dry skin and sleeping,replaces part HAC-504, HAC-504AW.Colour:As shownMaterial:wood pulp paperPackage Contents:4 * filter elementOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.