AprilAire Humidifiers can help you maintain optimal humidity to reduce the incidence of respiratory infections and symptoms related to allergies and asthma by minimizing the formation of bacteria and viruses, fungi, and dust mites. Balance your humidity to reduce the incidence of dry skin, static shock, and other dry air issues. Preserve your home and any contents susceptible to damage from changing humidity or dry conditions. This humidifier was designed and manufactured in the U.S.A. by AprilAire-the inventor of the whole-home evaporative humidifier, and the leader in Indoor Air Quality solutions. Dual sensor 24/7 auto mode measures the relative humidity inside the house. Fans turn on automatically when the humidity drops below the set point. Convenient Control to monitor and adjust the humidity with a high-contrast digital screen. For use in homes in any climate with ducted air systems, with or without forced air heat, and for homes that have special humidity requirements, such as wood floors, humidity-sensitive furnishings, large floor plans or short furnace run times. Full coverage with a capacity of up to 34.6 gallons per day in a tightly constructed home. Easily maintain optimal performance by replacing the canister every year, and having a licensed contractor replace the electrode wires every 3 years.