Whole-House Small Bypass Evaporative Humidifier - Model 500MODEL 500 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. PROTECT YOUR HOME Preserve your home and any contents susceptible to damage from changing humidity or dry conditions. HUMIDITY FOR COMFORT Balance your humidity to preserve