Its small footprint, sleek lines and digital controls make the D46 720 a perennial favorite. Our humidifiers work by adding invisible moisture to your environment 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. Proper humidity hydrates your skin, alleviates dry eyes, scratchy throats and can reduce snoring. With a doctor's approval increased humidity can reduce asthma and allergy symptoms. It also protects fine furniture, musical instruments, collectibles and wood floors. Proper humidity makes you feel warmer allowing you to lower your thermostat setting which will save money. It uses the #1040 Super Wick (True Value #752154).