The main objective of the present paper is to provide a visual investigation of the fire and water mist interference during the extinguish process.This kind of the experimental study for these processes is imposed by the phenomena complexity.The experimental study provides us the information of real behaviour of jets assembly in operation.On this way the physical theoretical model may by better conceived.The main test was focused on the concave shape of ceiling,which gives the better suppression of the flame.From the heat balance,of the studied case,the extinguish efficiency is obtained,the values being around 20%.From these values result that a lot of working agent is lost.That loss is related to the finest of the droplets in the liquid jet.The experimental tests give us the optimal angles between the two jets in aim to realise an efficient extinguish operation.
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