An exhaust system and a mini-exhaust static pressure controlling apparatus thereof for controlling a process area. After receiving a wager from a player at a gaming machine, play of the game is initiated. A substantial portion of particulates entrained in the suction airstream are separated therefrom when said suction airstream moves in a cyclonic fashion through the cyclonic chamber. For example, two tubular portions of the frame may extend generally horizontally across the same side or end of the frame to provide two lifting areas at different levels of the frame. Only when it is determined that a first next-processing necessity determining part determines necessity of the next processing, a control signal is generated to activate the next power supply group. Energy is further recovered from the flow of pressurized seawater that is supplied to the desalination system, resulting in a mechanically robust and energy efficient pressurization system.