3000 Series Humidifier Replacement Filters (HU3916/10 & HU3918/10) For hygienic air humidification, up to 99% less bacterial emissions than ultrasonic devices Filters bacteria and scale from water and prevents them from being released into the air 30mm thick wick absorbs and evaporates water efficiently 10,000 square feet of extended moisture removal area absorbs and evaporates moisture efficiently