BackgroundIndoor air quality has become a critical concern in schools, where hundreds of students and teachers share enclosed classrooms daily. In this particular teaching building, the existing central air conditioning system provided adequate ventilation but failed to effectively remove fine parti

Hebei Provincial Stomatological Hospital, established in 1992, is the only tertiary dental hospital in Hebei Province, integrating dental medical care, teaching, scientific research, preventive care, and oral public health.AIR CLEANING TECHNICAL SCHEMEAfter the epidemic, the hospital is particularly