| 摘要 |
PROBLEM TO BE SOLVED: To provide a centrifugal blower reducing the cost and lightly and rotationally moving a fan casing in changing the direction of a discharge port. SOLUTION: A fan casing 7 is provided so as to variably change the direction of the discharge port of a fan casing base 10 into a plurality stages, a support hole 11 having a diameter larger than the axis hole 9 is provided in a counter suction side sideboard 8 of the fan casing 7, a plurality of support bolts 12 are provided in the fan casing base 10 in such a state as bringing into an internal contact with the support hole 11, and the fan casing 7 is rotationally supported in changing the direction of the fan casing 7 so that a centrifugal blower lightly and rotationally moving the fan casing 7 in changing the direction of the discharge port at low cost.
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