An air treatment unit has: a) a frame； b) a source of UV light that is configured to disinfect air, the frame configured to be mounted in an operative position within a space in which air is to be disinfected, the frame configured to allow air from a duct through which air is forced into the space to be directed in a manner that expelled air from the duct is caused to be disinfected by UV light from the source of UV light with the frame and source of UV light each operatively positioned； and c) an air moving assembly that causes air within the space to be directed into a volume that has UV light rays from the source of UV light therein capable of disinfecting air.
