The purpose of this experiment is to re-new the air ventilation system to its original condition, decrease the amount of airborne diseases, and to decrease the cost and work needed to maintain the air ventilation system. Past research done by Green F. and Scarpino V. suggests that ultra-violet light systems helped efficiently reduce the amount of bacteria in the air, without causing harm to people. Another experiment conducted at University of Colorado also suggests that the usage of ultra-violet light systems helps decrease air contaminants. Similarly this experiment deals with placing a ultra-violet light system in an air handler to help kill airborne bacteria and germs. It was hypothesized that if a ultra-violet light system is placed in an air handler then the amount of airborne bacteria and germs will decrease. The independent variable is the ultra-violet light system. The dependent variable is the amount of airborne bacteria and germs. A control is not valid in this research. Some constants include location, temperature, and methods of data collection. To conduct this experiment bacteria samples were taken from the air handler. Then the ultra-violet light system was set-up and run for a few weeks. After the system was kept running for a few weeks, another set of samples were taken. Data from before and after were compared. This experiment took place over the time span of several weeks and it took place in Amity High School, Woodbridge. Data was measured through the growth of the bacteria collected and amount of bacteria collected. It was concluded that the ultra-violet light system does decrease the amount of airborne bacteria and germs. Results show that samples collected before contained bacterial areas and bacterial growth. However, samples collected after the set-up of the system showed no sign of bacterial areas or bacterial growth. More samples will be taken during future months to further support the hypothesis.