Project Introduction：Beijing air smog is more serious. The original air-conditioning and fresh air system of the customer is sent by the large-scale new air blower unit. Although there is a simple bag-type primary effect filtration, the effect is not satisfactory, and the medium-high efficiency filter will increase the wind resistance and replace the consumables for a long time. It is also expensive. We have added electric dust purifiers to the original new wind turbines and air-conditioning return air sections for the actual problems of customers. We use electric dust removal to avoid frequent replacement of consumables, and the wind resistance is smaller, and the utilization pressure of each node is used. The real-time operating status of the differential sensor and BA interface is fed back to the customer IT room, which facilitates the unified management and maintenance of the customer, making the PM2.5 filtering effect in the office room more than 98% efficient, and more intelligent through the management of the BA system, and air conditioning. Linkage, maintenance reminders, optional human closure, etc.