between concentrations, or the area under the curves .With different contaminant source distribution, one study even
defined three levels of ventilation efficiency in order to evaluate the distributions of ‘ventilation effectiveness’ at each point in a room In fact, a paradigm for using ventilationwas established in the 1930s as a means of achieving thermal and odor omfort in the built environment The local ventilation effectiveness expresses the ability of a ventilation system at different parts of a room