Shenzhen Huarun Building Office Building, although equipped with independent central air conditioning and fresh air equipment, has only installed the primary and intermediate filter sections. With the deterioration of air pollution, the system has been unable to provide clean fresh air. After the current survey, the original air-conditioning fan coil of the pipeline, office, conference room and smoking room of the new fan room is installed under the premise that the wind is unchanged and the original indoor pipeline is not changed. Equipment, indoor air quality has been significantly improved. Improve work efficiency, while preventing the spread of pathogenic organisms such as epidemic viruses among colleagues.