extinguisher fire fire extinguisher fire-extinguisher fireman foam extinguisher shade shadow shape silhouette accident alarm burn caution chemical device emergency equipment extinguish fire extinguisher logo firefighter flame foam handle hazard heat help logo object pictogram precaution protection red rescue safe sign spray warning white work advice aid alert announcement assist assistance availability available aware awareness blue communicating communication concern directions fire-control firefighting information informing limitations limited location observant observe risk risks safety signs hydrant nozzle powder property