Honeywell UV100A1059 Ultraviolet Surface or Air Treatment System Residential ductwork naturally circulates and spreads airborne pathogens. Honeywell's UV air treatment system has been shown to eliminate 87% of airborne pathogens in a single pass of air, making it an excellent addition to any domestic air cleaning system. The UV system utilizes Honeywell's SnapLamp technology, allowing for easy, economical changing of the UV bulb. Single and dual bulb configurations are available for any level of air purification need. The UV treatment system plugs into a standard home electrical outlet, and an optional AIRWATCH indicator provides an easy indication of when a bulb needs to be changed.