This device is used to clean the gas from the factory’s discharge. The gas will be filtered and clean before releasing to the environment. The particles from the gas is remove using electrostatic force. A negative voltage of several thousand volts is applied between wire and plate. If the applied voltage is high enough an electric (corona) discharge ionizes the gas around the electrodes. Negative ions flow to the plates and charge the gas-flow particles. The ionized particles, following the negative electric field created by the power supply, move to the grounded plates.