Installation for fighting fire

Installation for fighting fire, comprising at least one sprinkler or spray head (6;33;55;62;72) in connection with a monitored space (1;30;50;60;70), said at least one sprinkler or spray head being arranged upon activation to create a suction out of the monitored space by spraying liquid from a high drive pressure into the form of small droplets, like a fog, thereby to suck smoke from said monitored space, wherein said at least one sprinkler or spray head is arranged in an opening (8;58) into said monitored space from an air passage (7;12;19;34;57;63;73) which is in communication with at least one further opening (9;35;59;64;65;74;75) into said monitored space so that said at least one sprinkler or spray head, when activated, produces a suction into said air passage and a circulation of said liquid in the form of small droplets in said monitored space.