When the pump work, continuous water supply the water to overflow, overflow, the water curtain waterfall shaped curtain in the board. Air . Air supply unit will air from the top of the chamber body evenly into the fresh air channel, exhaust fan formed by water and the chamber body will operate from the lower part of the water polluted air is sucked, so as to ensure the indoor air circulation flow injection. When painting, a part of paint mist sprayed with water curtain plate, washed into the water tank, not captured paint mist with air top blowing through the water screen plate at the lower part of the paint spray washing device and washing water is fully mixed, the airflow formed mixed the paint mist larger drop the water retaining plate barrier, the vast majority of back to the water tank, the remaining waste gas by activated carbon to filter, clean air through the exhaust pipe into the atmosphere.