A system to disinfect, prefiltered air using ultraviolet radiation (UV), said system comprising: (a) an air containment vessel (130) (b) an air inlet tube (110) constructed of a non-UV-absorbing material, extending into said air contrainment vessel, and comprising an entrance end (111), a distally opposing exit and (112), an internal surface (121) in contact with said air, and an external surface (c) total internal reflecting features disposed up-on at least a portion of the external surface of said air inlet tube (d) an ultraviolet inlet aperture (135) only optically penetrating said air containment vessel (e) a high intensity ultraviolet lamp (40) arranged in such a manner that ultraviolet radiation provided from the lamp (40) passes through said ultraviolet inlet aperture and impinges upon the internal surface of said inlet tube and (f) an air outlet (150) extending from said air containment vessel.
