Abstract: The nozzle has gooseneck shape and defines a gooseneck hollow elongated interior passage within head and neck portions of the nozzle, the air, high voltage and control lines entering the passage at the end of the neck portion, the high voltage and compressed air lines extending together lengthwise in the hollow and terminating in the head portion of the nozzle, the nozzle having an elongated body including a removable plate having gooseneck shape and extending at a concave side defined by the body, the plate bridging the head and neck portions to provide access to the major length of the passage and to ion dispensing tips when the plate is removed.

Abstract: An electrostatic air cleaning device, comprising:(a) a housing including an upright tubular shell, having an upper air inlet and a lower air outlet,(b) a fan in the housing for effecting air flow into the inlet, downwardly in the shell, and out the outlet,(c) an upright post in the shell,(d) a frame received downwardly in the shell, and vertically spaced, electrically conductive grids carried by the frame; the grids defining openings to pass the post as the frame is received downwardly into the shell,(e) an electrical cable associated with the post, and tips connected to the cable and exposed to air spaces defined between the grids, and(f) circuitry to supply high voltage of one polarity to the cable tips, the grids being at a different voltage level such that ions discharged from the tips cause collection at the grids of particulate in air flowing downwardly in the shell.