The U.S. Standard for Government Buildings requires that "Ultraviolet light (C band)
emitters/lamps shall be incorporated downstream of all cooling coils and above all drain pans to
control airborne and surface microbial growth and transfer. Applied fixtures/lamps must be
specifically manufactured for this purpose."
"Ultraviolet radiation, properly integrated with the heating, ventilating and air conditioning
systems, shows the most promise as a widely applicable means of air disinfection."
Airborne Infection, by Richard l. Riley, M.D.
American Journal of Medicine,