SmartLamp ultraviolet (UV) air treatment system coil delivers worry-free operation with automatic brownout and high temperature protection. Intelligent sensors and controls protect unit from extreme conditions and optimize life of UV lamp. Communicates with home appliances through Enviracom™ three-wire bus. Return air models with integrated airflow sensor to monitor air flowing through the ductwork. Ultraviolet-C light kills airborne bacteria or surface mold. Continuously emits ultraviolet energy. UV lamp does not produce ozone. Sealed unit design prevents accidental installer and homeowner contact with voltage and with ultraviolet rays. Safe design prevents lamps from lighting unless base is correctly mounted on HVAC duct. Lamp light indicator to safely view lamp operation. Power cord plugs into electrical outlet. Quick and easy bulb replacement. SnapLamp™ features replacement lamp handle with detachable replacement bulb, UC18-watt or UC36-watt, to make replacement more economical. Easy lamp maintenance. Optional AIRWATCH™ Indicator can be installed to remind customers when to change bulb. To capture and minimize micro-organism pass-through in residential heating, ventilation and air conditioning (HVAC) systems, combine Ultraviolet System with high-efficiency air filtration system that includes an electronic air cleaner.