2Pack Humidifier Filters For Aprilaire 35 350 360 560 568 600 Lennox WB2-17 WB3-
Compatible with Aprilaire 350 360 560 560A 568 600 600A 600M 700 700A 700M 760 760A 768. Replace air filter 6 month or more often depending on your humidifier air filter quality and use to ensure peak performance of your humidifier.