Abstract: An electrostatic air cleaning apparatus having a source of relatively large magnitude electrical voltage. The cell comprises a charged ionizing section and a collecting section comprising a charged grid and a grounded grid sandwiching therebetween a sheet of foraminous filter media. One of the grids is movable relative to the other grid. A single bus bar electrically connects the ionizing section and the charged grid to the source of voltage. The movable grip is positioned with respect to the stationary grid via support surfaces. Retainers maintain the movable grid in its desired position.

Abstract: A mounting system for ionizing wires of electrostatic precipitation apparatus including a bus bar having a plurality of slots formed along the axial length thereof. A plurality of ionizing wires are spaced axially along the length of the bus bar and extend transversely thereto. At least one end of each of the ionizing wires is connected to a resilient spring. Each of the resilient springs are disposed in the slots formed in the bus bar. The springs function to transfer voltage from the bus bar to the ionizing wires and in addition function to maintain the ionizing wires under tension.