BLOWER CONTROL SYSTEM

PROBLEM TO BE SOLVED: To contrive not to cause a malfunction in which actuation of a sub-blower becomes disabled by a method wherein after starting a control of enerization of the sub-blower, an opening operation of an opening or closing damper is started either when a set delay time elapses or when a detected inner pressure in an air passage at a downstream side of the sub-blower is increased from a set initial value to a set stable value. SOLUTION: A valve member 22 of an opening or closing damper Ds and an air feeding blower 9 of a sub-blower Fs are arranged in sequence from an upstream side in a flow dividing air passage Rs formed by a connected air passage 5 and an air feeding passage 10. When an actuation command of the sub-blower Fs9 is given under the operation state of the main blower 3, air feeding pressure control devices 28, 19 of the system and a control device 24 of specified air amount device for a system inlet may start an actuation control for the sub-blower for automatically adjusting an air blowing amount of the sub-blower Fs9 in such a way that an inner pressure Ps in a down-stream side air passage is gradually increased from a set initial value at a specified speed on the basis of a detected information of the inner pressure Ps of the down-stream side air passage of the sub-blower Fs9 prior to an opening operation of the opening or closing damper Ds 22 and then after the set delay time elapses, an opening operation of the opening or closing damper Ds 22 is started.