Abstract: The disclosure is of an air filtering assembly which may be usefully installed as a filter component in conventional residential and commercial air-conditioning systems. The assembly is effective in filtering out allergens and even particles as small as 0.3 microns in size (which are the average size for tobacco smoke particles). The assembly comprises a housing, prefilter, collector section, ionizing section and a unique mode of suspending the ionizing wire in the ionizing section. The wire is supported on a spring-loaded insulator which "floats" on the end of the ground blade component. The advantage of the latter feature is its facilitation of the threading of the ionizing wire during production, thereby reducing the cost of manufacture.