# US 5,702,299 A · Method and installation for removing smoke from a monitored space > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,702,299 A - Document ID: US5702299A - Status: Granted - Kind: A - Application number: 08/535,294 - Filed: 1995-11-03 - Granted: 1997-12-30 - Earliest claimed: 1993-05-11 - Inventors: Goran Sundholm - Web page: https://patentgrep.com/patent/US5702299A ## CPC - A62C 99/0072: {using sprayed or atomised water} - A62C 35/60: wet, i.e. containing extinguishing material even when not in use - F24F 7/003: in combination with air cleaning - F24F 7/065: {fan combined with single duct; mounting arrangements of a fan in a duct} - F24F 11/34: by opening air passages - F24F 2006/146: {using pressurised water for spraying} - A62C: FIRE-FIGHTING (fire-extinguishing compositions, use of chemical substances in extinguishing fires A62D1/00; spraying, applying liquids or other fluent materials to surfaces in general B05; alarm arrangements G08B, e.g. fire alarms actuated by smoke or gases G08B17/10) - F24F: AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING (removing dirt or fumes from areas where they are produced B08B15/00; vertical ducts for carrying away waste gases from buildings E04F17/02; tops for chimneys or ventilating shafts, terminals for flues F23L17/02) ## Abstract In a space (1) and an installation for fighting a fire in the space, and further including a shower room (3), a through-wall opening into the shower room from the space and at least one ventilation or air-conditioning duct (5) out-going from the shower room, at least one spray head (11a) sprays liquid in the form of small droplets, like a fog, into the ventilation or air-conditioning duct (5) to produce a suction, whereby to draw smoke out of the shower room. A sprinkler (6) in the space is arranged, upon release, to activate a further spray head (8) in the opening to produce a suction from said space, whereby to draw said smoke into the shower room for the ventilation or air-conditioning duct. ## Claims ### Claim 1 In a method for fighting a fire in a space with a ventilation or air-conditioning duct out-going therefrom, the space being divided into fire sections with section valves, the improvement of said method comprising: closing all of said section valves except one relating to a smoke alarm signal; and after a predetermined delay therefrom, signaling a fire-fighting drive unit for spraying high pressure liquid in the form of small droplets, like a fog, from at least one sprinkler or spray head into said ventilation or air-conditioning duct to produce a suction from said space into said ventilation or air-conditioning duct, whereby to remove smoke gases from said space. ### Claim 2 In a space (1) and an installation for fighting a fire in said space, and further including a shower room (3), a through-wall opening into said shower room from said space and at least one ventilation or air-conditioning duct (5) out-going from said shower room, the improvement of said installation comprising: at least one spray head (11a) for spraying liquid in the form of small droplets, like a fog, into said ventilation or air-conditioning duct (5) to produce a suction, whereby to draw smoke into said ventilation or air-conditioning duct from said space; and a sprinkler control device (6) in said space and arranged to, upon release, to activate a further spray head (8) in said opening to produce a suction from said space past said further spray head, whereby to draw smoke into said shower room for removal by said ventilation or air-conditioning duct. ### Claim 3 (depends on 2) Installation according to claim 2, wherein said at least one spray head (11a) is arranged to be activated on the basis of smoke indication. ### Claim 4 (depends on 2) Installation according to claim 2, and further comprising a further sprinkler (11b) in combination with said at least one spray head, directed oppositely with respect to said at least one spray head and pressure balanced therewith by having a liquid feed (14) in common with said at least one spray head. ### Claim 5 In a space (1) and an installation for fighting a fire in said space, and further including a toilet room (3), a through-wall opening into said toilet room from said space and at least one ventilation or air-conditioning duct (5) out-going from said toilet room, the improvement of said installation comprising: at least one spray head (11a) for spraying liquid in the form of small droplets, like a fog, into said ventilation or air-conditioning duct (5) to produce a suction, whereby to draw smoke into said ventilation or air-conditioning duct from said space; and a sprinkler (6) in said space arranged, upon release, to activate a further spray head (8) in said opening to produce a suction from said space past said further spray head, whereby to draw smoke into said toilet room for removal by said ventilation or air-conditioning duct. ### Claim 6 (depends on 5) Installation according to claim 5, wherein said at least one spray head (11a) is arranged to be activated on the basis of smoke indication. ### Claim 7 (depends on 5) Installation according to claim 5, and further comprising a further sprinkler (11b) in combination with said at least one spray head, directed oppositely with respect to said at least one spray head and pressure balanced therewith by having a liquid feed (14) in common with said at least one spray head.