Horizontal air jets system was developed to keep smoke out of the safe area, which was designed to allow free access of people from escape routes. Full scale experiments were conducted to study the distribution of air velocity, temperature and CO2 concentration in real pool fires. Smokeproof ratio and air change rate of the safe area were estimated by the air balance model from results of the experiment. Horizontal air jets were numerically simulated using the standard k-ε model of turbulence. Computed results were compared with experimental data to assess the accuracy of prediction. The smokeproof effect of horizontal air jets in crowd movement was evaluated with dummy bodies arrayed in front of air nozzles.
