Building refrigeration and ventilation system supply fresh air for the building to improve the ventilation condition in buildings. But after years' use the ventilation systems like the duct may get dirty. Myriad of dust will accumulate in the interior of ventilation duct and fungi, bacteria and other microbes will proliferate there. Our integrated plasma and electrostatic precipitator employs high voltage and electrostatic techniques to deactivate and collect microbes, thus cleaning the inflow air of hospitals, shopping mall etc. Compared with conventional filters, its low resistance guarantees little air flow decrement and can be reused after cleaning.