Humidifier 1900 Square Ft 9Gpd 2 fan speeds, adjustable humidistat, auto shutoff, water refill and check filter indicator. Outstanding daily output up to 9 gallons and a tight construction coverage area up to 2800 Sq. ft. (tight.) / 1900 Sq. ft. (avg.) Fill the unit?s large 6 gallon ta nk with water, set your humidistat to the desired humidity level, and enjoy the fantastic benefits of whole home humidification.