Plate type air filter applies good quality chemical fiber filter material as filter medium and aluminum alloy sections,galvanized steel plate,hard paper plate and so on as external frame;it is mainly used in general ventilation air-conditioner and purification ventilation air-conditioner system.Plate type primary effect air filter is mainly used to filter dust particle of ≥5μm in air-conditioner system to protect and prolong the service life of medium efficiency filter.