Abstract: An electronic air cleaning assembly is provided wherein the collector plates are of identical configuration for both the high voltage and gounded plates. The collector plates are provided with a plurality of clearance holes of a generally circular shape and a plurality of spacing holes of a generally rectangular shape. The plates are spaced and supported by tube members having a diameter approximately equal to the width of the rectangular holes. Each tube is provided with a series of spaced slots extending partly therethrough and of a width for engaging one side wall of a rectangular hole in alternate plates thereby spacing and holding the plates in fixed relationship to one another.A doubled corona charging wire arrangement is also provided wherein a continuous length of wire is used in forming the ionizing section of the electrostatic air cleaner but each cooperative pair of wires is tensioned by an individual tensioning spring.