1、Compatibility: 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. 2、Efficient Air Filtration: The humidifier wicking filter features a high efficiency particulate air filter with an environmentally friendly grid structure, ensuring cleanliness and longevity in performance. 3、Superior Air Quality: Effectively filtering water impurities, the humidifier filter disperses fine mist into the air, showcasing exceptional performance in enhancing overall air quality. 4、Optimal Water Use: Fill the humidifier's tank with distilled water only, as hard water may reduce filter efficiency and cause premature yellowing, ensuring dependable performance. 5、Regular Maintenance: For optimal performance, replace the humidifier filter cartridge every 1 to 2 months, depending on usage and local water quality, to maintain efficiency. Item Type: Humidifier Wicking Filter Material: High Efficiency Particulate Air Filter Weight: Approx. 135.00g/4.76oz Product Size: Approx. 15x13.1cm/5.9x5.15in 2 x Humidifier Wicking Filter