Sprinklers are the most popular and reliable system for controlling fires. But the studies on smoke behavior with sprinkler activation are hardly studied. In This paper, smoke behavior with sprinkler activation was studied. Experiments were conducted on a full scale and the following results were obtained; the temperature of the upper layer was decreased, and the lower layer was raised by effect of water spray. As amount of water increased, CO2 density of the upper layer was decreased and lower layer was increased.
