Reading the fire   Spraying water on the ceiling with a short pulse of a diffused spray eg cone with an opening angle of  to test the heat of the smoke   Ive always been taught that a diffused spray will only fill up the room with all kinds of hot steam and be detrimental to visibility and survival of anyone in the room watersteam expansion rate is very high and to opt for a straighter stream using a penciling technique  Anybody else learned this way