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Ventilation performance depends on room geometry, ventilation method, and operating conditions as well as location and strength of the source and types of contaminants. A personal computer based application of computational fluid dynamics was developed that is capable of determining the turbulent flow field and time-dependent/steady-state contaminant concentration distributions within isothermal indoor space. The computational speed is extremely fast. The flow field calculated from this 2-D k-epsilon turbulence model showed good agreement with results from the commercially available FLUENT code. Ventilation performance was evaluated using the 'ventilation performance index. ' Effects of room configurations, operating conditions, and effective diffusion coefficient (or Peclet number) on ventilation performance were investigated