Whole-House Large Bypass Evaporative Humidifier - Model 600MODEL 600 FEATURES: HUMIDITY FOR HEALTH AprilAire Humidifiers can help you maintain optimal humidity in your home which has been shown to reduce the incidence of respiratory infections and symptoms related to allergies and asthma by minimizing the formation of bacteria and viruses. HUMIDITY FOR COMFORT Balance your humidity to preserve your home and protect its occupants from dry air issues like static shock and chapped skin. PROTECT YOUR HOME