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Abstract
Smoke management system is the most important parameter in the design of modern buildings. As smoke is toxic so it has a deadly effect on occupants. This research studies the effect of change heat release rate (HRR) in case of natural ventilation system on CO concentrations, temperature, smoke layer height and visibility at different locations in a closed indoor arena. The effect of using mechanical ventilation system with different (ACH) and the effect of change fire locations on the previous parameters was also studied