The Vevor commercial humidifier features a 21 L / 5.5 gal water tank and ultrasonic cool mist output for spaces from 473.6 to 1291.7 sq ft. It offers adjustable humidity control from 40%RH to 90%RH, a 12-hour timer, and multiple mist discharge options for flexible coverage. The top-fill design, included water hose, and visible water level window make refilling simple. Bottom casters allow easy movement in large spaces, and the unit operates at a low noise level of 35 dB or less. It is suited for homes, offices, warehouses, greenhouses, supermarkets, and factories.