Smoke is one of the major hazards on to the occupants in atrium fires. It is commonly accepted that the smoke should be timely V. exhausted. Make-up air must be supplied simultaneously to the atrium in order to keep the smoke exhausting efficiency. The amount of make-up air therefore acts as a key factor of the smoke management system design. Numerical simulations were performed in this study to investigate the impact of make-up air on the smoke exhausting efficiency. Results show that when a 30% or more of the amount of smoke exhaust for make-up air is able to be kept smoke exhausting process efficient. The "as ftmuch as possible" concept for make-up air should not be considered regarding the research results.
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