Installation and maintenance of systems against fire systems: detection and alarm, water supply, hydrants, equipped fire hydrants, dry column, fixed extinguishing by automatic sprinklers and water spray, fixed extinguishing by water mist, fixed extinguishing by physical foam, fixed extinguishing by powder, fixed extinguishing by gaseous extinguishing agents, fixed extinguishing by condensed aerosols, for smoke and heat control and luminescent signaling. Constructions, reforms and installations of metallic structures and all their components.