Patent ID: 8408865

Claim:
A blower apparatus comprising: a main frame of a box-like shape provided with a main-frame inlet port and a main-frame outlet port in side surfaces confronting each other, the main-frame inlet port for taking in air and the main-frame outlet port for delivering the air; and a plurality of centrifugal blower units for suctioning the air taken inside of the main frame from the main-frame inlet port, through a blower inlet port, and for discharging the air from a blower air outlet toward the main-frame outlet port, wherein the main frame is provided with a maintenance opening in one of surfaces other than the side surfaces having the main-frame inlet port and the main-frame outlet port for the purpose of checking the inside of the main frame, the main frame is provided with a partition plate having a plurality of openings corresponding to the plurality of centrifugal blower units, the partition plate arranged facing the main-frame outlet port and includes an offset portion between the plurality of centrifugal blower units, and the plurality of centrifugal blower units are disposed one another in a direction toward the maintenance opening in a manner that a difference in discharging spatial distances from the blower air outlets of the adjoining centrifugal blower units to the main-frame outlet port is equal to or greater than an outer diameter of an impeller of the centrifugal blower unit located nearest to the maintenance opening.