Patent ID: 7323065

Claim:
A method of controlling the presence of surface and airborne microorganisms in an air handler having a heat transfer coil comprising a tube and a plurality of spaced parallel fins and defining a surface, comprising intermittently energizing a germicidal lamp to emit distributed UVC radiation wherein the germicidal lamp is energized during and after a cooling cycle of the air handler until the surface is organically clean positioning the germicidal lamp in proximity to the heat transfer coil, wherein the intensity of the UVC radiation striking the heat transfer coil is, to a degree, independent of the distance of the germicidal lamp to the heat transfer coil directing the UVC radiation across the coil face to the coil's tube and fins reflecting and directing the ultraviolet radiation by the coil's tube and the fins-throughout the coil, thereby increasing the flux density of the ultraviolet radiation and the dosage of the radiation applied to airborne microorganisms and microorganisms carried on the surface.