Sanitary control should be strengthened to the centralized air ventilation system.
公共场所集中空调通风系统应加强卫生管理。
To research sanitary condition of the centralized air ventilation system in public place; provide the basis for sanitary control.
调查分析公共场所集中空调通风系统卫生状况，为卫生管理提供依据。
Dust sample in blast pipe was collected when centralized air ventilation system was off, the total content of the bacterium and fungus was examined.
集中空调关闭期间，采集集中空调通风系统送风管内的积尘样品，检测其细菌总数、真菌总数；
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