A simplified methodology for numerical simulation of air flows around and above ventilated chairs in a theater or auditorium has been developed. It uses a simplified method for describing the air diffuser geometry (N-point momentum model), a simplified turbulence model (zero-equation turbulence model) and an error pretreatment method. It has been applied to a room ventilated through air supply openings in the chair bases. Simulation results (air temperature and velocity distributions) show good agreement with experimental data.