The company has introduced three UV germicidal lamps for rooftop heating and cooling applications. Model 1972 is installed on the inside of HVAC equipment, where multiple units are needed to cover large coils or when it is not feasible or desirable to penetrate the housing of the equipment. Model 1952 is a 24-in. unit and Model 1953 is 32-in. unit, and both are mounted on the outside of rooftop heating and cooling systems.