ROOM PRESSURE CONTROL SYSTEM

PROBLEM TO BE SOLVED: To obtain a room pressure control system, high in the control property of a room pressure. SOLUTION: A room pressure control system is constituted of a room pressure control means 19, and a duct pressure control means 24. The room pressure control means 19 regulates opening degrees β of room pressure regulating dampers 17, corresponding to respective objective rooms R1 to R4 based on respective detecting room pressures p of the objective rooms, to regulate the room pressures (p) of respective objective rooms R1 to R4 so as to obtain an objective room pressure mp. The duct pressure control means 24 regulates the output of the fans 4 based on the detected opening degrees β of respective room pressure regulating dampers 17, so that respective opening degrees βof the room pressure regulating dampers 17 will be within an objective opening degree range Y, in the room pressure regulation through the room pressure control means 19. In this case, the duct pressure control means 24 is limited with respect to the opening degree β of the room pressure regulating damper 17 for a specified room among the objective rooms R1 to R4 in the regulating factor of a fan output, compared to the opening degrees β of other room pressure regulating dampers 17 to control the outputs of the fans.