... not independent of, but based on, previous research on PV system, local exhaust system in the field of reducing the transmission of infectious air in indoor environments, ventilation in healthcare ... control of the combined PV-PE system in conjunction with background MV or DV systems in terms of the localized extraction of the contaminated exhaled air from an Infected Person in healthcare settings ... 2 010 , 2 011 ; Zítek et al 2 010 ) So far no study has evaluated the combination of PV and LEV in healthcare settings In the field of ventilation design in healthcare centers and hospitals, a lot of studies...