The Emerson Complete UVC Light System is designed for HVAC air stream disinfection and surface irradiation. The 18-watt single and 36- watt double bulb UVC lamp is a powerful tool for improved indoor air quality. The UVC Light System can be installed in the HVAC ductwork (in either the return or supply side of the furnace or air handler) for airstream disinfection or installed over the A-coil for surface irradiation.