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The Evap40 Whole Room Evaporative Vortex Humidifier creates a comfortable perfectly humidified living space quickly and quietly. Vornado’s deep pitch blades pull large volumes of harsh dry air through two humidifying filters and then using Vornado’s signature Vortex Action circulates the humidified air throughout the room providing complete and uniform humidification in spaces up to 1000 sq. ft. The Evap40 delivers automatic humidity control with a built-in humidistat. An easy-to-use control panel allows you to choose your desired humidity level and fan speed low medium or high. Its extra-large 4 gallon capacity provides up to a 4 gallon water output when operated continuously on high allowing for long uninterrupted operation and fewer refills.