Vornado evaporative whole room humidifier ev100, 1 gallon, 300 sq. Ft. the ev100 sets the standard for whole-room humidification using natural evaporation, which eliminates the mist and messy white dust other humidifiers leave behind. Along with its modern, minimalistic design, the ev100 features push-button controls and multiple humidity settings, allowing you to personalize your humidity experience. Its crystal-clear tank was designed so that one glance shows you when to refill and, when it’s time, it’s a breeze – a removable cap simplifies refills. The easily cleanable humidifier and grill, integrated handles and other safety features ensure a comfortable breathing environment with peace of mind, along with a 5-year satisfaction guarantee. features: whole room humidification up to 300 sq ft automatic humidity control vortex assisted humidity distribution evaporative humidification 1 gallon tank capacity up to 1 gallon output in 24 hours push button controls simple tank, system 5 year warranty 1 filter included