Ultraviolet light in the ‘C’ band is referred to as’ germicidal light’ because of its ability to inactivate and neutralize biological contamination of air, water, and surfaces. This presentation will provide an overview of the fundamentals of installing germicidal light to accomplish two primary objectives; neutralizing airborne virus, bacteria, and mold (airborne pathogens) for improved indoor air quality, and eliminating biological surface contamination within AHU’s / cooling coils to increase energy efficiency and address decarbonization.

We will discuss the new ASHRAE Standard 241 Standard,’ Control of Infectious Aerosols’. The 241 standard establishes minimum requirements for reducing the risk of disease transmission through exposure to infectious aerosols in buildings (infection Risk Management Mode, or IRMM), and heavily relies on the use of both in-duct and upper air germicidal UV fixtures.