About this Product: The H12 400HB offers convenient whole house coverage in a single bottle design. It adds invisible moisture to your home by moving dry air through a saturated wick. Maintaining proper humidity levels between 30-50% in your home/office/workplace has been scientifically proven to help prevent the flu and allergies. It reduces static electricity, relieves dry skin and scratchy throat, and protects fine furniture and wood floors. Proper humidity makes you feel warmer allowing you to lower your thermostat setting which will save money. Use of a ceiling fan helps distribute moisture output. 5.4-Gallon water capacity Up to 3700 square feet coverage Up to 11.83-gallon daily output 4-Speed motor with analog controls with digital display Adjustable humidistat and automatic shut-off Water refill and check filter indicators Casters for easy mobility Easy-fill water bottle w/refill hose