This Honeywell Cool Moisture Tower Humidifier is ideal for large rooms (500 sq. ft.), and is quick and easy to use and clean. It features a removable top fill tank that makes it easy to fill at the sink or with a pitcher. It has a space saving slim tower design that is optimized for high moisture output, and can run for up to 24 hours. Enjoy filtered invisible moisture using the Easy Set humidistat with 5 humidity output settings, as well as 3 speed settings. Program the humidistat to your personal comfort level and the humidifier will cycle on and off to maintain your set humidity level. A refill light tells you when the tank is empty and a filter check light reminds you to check your filter for optimal performance. The large tank opening and easy-access filter cartridge make filling and cleaning easy. Compatible with Honeywell Replacement Wicking Filter T (HFT600).