Electrostatic Air Cleaner air flow 4.0 x 103 V- 0.30 cm OFF +++ An electrostatic air cleaner is a device that removes polluting particulates, thus purifying air. As an example, contaminated air carrying a particulate, with a mass of 3.15 ' 10-9 kg, will first pass through a charging grid, removing an electron and charging the particulate with a +1 charge. These positive particulates are then removed by being attracted to the negative grid and remaining on the grid as the rest of the clean air passes through