Patent ID: 7172387

Claim:
A fan guard of a blower unit, comprising: a plurality of annular ribs, provided between a blocking plate arranged at a central part and an outer frame arranged at an outer periphery, arranged coaxially in a radial direction at predetermined intervals with the center of the blocking plate as a center, and a plurality of radial ribs extending radially and arranged at regular intervals in a peripheral direction, wherein the fan guard is mounted at an air outlet of the blower unit having a blower fan, wherein: the radial ribs include a plurality of inner ribs extending from the blocking plate to a substantial center in the radial direction and arranged at regular intervals in the peripheral direction, wherein the inner ribs terminate at the substantial center in the radial direction and a plurality of outer ribs extending from the substantial center in the radial direction to the outer frame and arranged at regular intervals in the peripheral direction, and the number of the inner ribs is set smaller than the number of the outer ribs.