FILTER DESIGN FIT FOR: -300 Series: -300T, -305T, -310T, -315T, -350, -350B, -350W, -450BCST, -500 Series: -530, -535, -535-20, -540, -550, -550-19, -551, -560. -600 Series: -630, -631, -632, -632TG, -635, -640BW, -645, -646, -650, -700 Series: -710, -1000 Series: -1000, -1000C, -1010, -2000 Series: -2000C, -2001, -2002, -2020, -2050, -2051, HCM2052, HEV-312, HEV-355. HIGH QUALITY: Made of environmentally friendly professional import filter to 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:White Material:plastic Package Contents: 2 x filter elements Only the above package content, other products are not included. Note: Light 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.