Patent ID: 8360163

Claim:
A compartmentalized filter cabinet that internally contains an inlet sub-chamber (K 1 ) for polluted air and an outlet sub-chamber (K 2 ) for filtered air, separated from one another by a filter wall (FW) comprising filter material that is placed in the compartmentalized air filter cabinet between the inlet and outlet sub-chambers (K 1 , K 2 ), such that air can through the filter wall material from the inlet sub-chamber to the outlet sub-chamber (P 16 , L 6 ); and comprising a fire extinguishing system, wherein, the fire-extinguishing system comprising a first sensor (TS) and at least one second sensor (S 1 ), a first fire extinguisher (A 1 ) and at least one second fire extinguisher (A 2 ), and a control unit (R 1 ), in which: the first sensor (TS) and the first fire extinguisher (A 1 ) are placed in the inlet sub-chamber (K 1 ) and the second fire extinguisher (A 2 ) is placed in an outlet sub-chamber (K 2 ), the fire extinguishes being arranged for producing, as an extinguishing agent, an aerosol of solid particles type; the second sensor (S 1 ) is placed in an outlet (UB) of the outlet sub-chamber (K 2 ); the control unit (R 1 ) is connected to the first sensor (TS) in the inlet sub-chamber (K 1 ), and to the second sensor (S 1 ) in the outlet (UB); the control unit (R 1 ) is connected to the first fire extinguisher (A 1 ) and to the second fire extinguisher (A 2 ) for controlling a release of the solid particles type aerosol as the extinguishing agent from the first and second fire extinguisher, respectively, and the control unit (R 1 ) is designed for recording a first fire-detection signal from the first sensor in the inlet sub-chamber (K 1 ), and a second fire-detection signal from the at least one second sensor in the outlet (UB); comparing the first signal and the second signal to an associated predetermined threshold value to determine if a fire is burning; determining at which location within the inlet and outlet sub-chambers the fire is burning as a function of the result of the comparison of the first and second signals, respectively; selecting which of the first and at least one second fire extinguisher is located at the detected location, and activating, by means of one or more control signals, the one or more selected ones of the first and at least one second fire extinguisher in order to release the extinguishing agent.