PURPOSE: To extinguished fire along with the disposal of pollutant gas when a fire brakes out in the experimental apparatus of a space vehicle, by stopping air discharge to an outer space when the pollutant concentration in air in closed space is turned into an allowable level or lower, and after that, by permitting air from the closed space, to pass a pollutant gas processor, to adsorb and remove residual pollutant gas.

CONSTITUTION: When the pollutant concentration of gas comes to a fixed allowable value on a timing normalize by sequence control, then by this controller, the exhaust gas valve 19a of an exhaust gas pipe 18 communicated with the outer space of a rack 2a is closed, and gas discharge to the outer space is stopped. Then, the exhaust air valve 11a of an exhaust air pipe 10 is opened, and at the same time, valves A, B on both the sides of a processor 25 set bypassing the exhaust air pipe 10 are released, and the valve C of the exhaust air pipe 10 is closed. Air fed to an air blower 7 from the exhaust air valve is permitted to pass the processor 25, and meanwhile, residual fine pollutant substance mixed in the air is adsorbed and is removed therefrom. As a result, a ready-set equipment connected to the rack 2 of a manned space vehicle 4 is effectively used, and even if any fire breaks out in the rack, the fire can be efficiently extinguished.