| 摘要 |
A plurality of fan unit mounting projections are each extended substantially in parallel with a rotary shaft of a fan included in a fan unit and are provided integrally to a fan unit mounting part. A belt-shaped elastic body is hung onto each of the fan unit mounting projections, and is made in contact with a plurality of locations on an outer peripheral part of the fan unit. The fan unit is retained, while being spaced apart from the fan unit mounting part in a direction along the rotary shaft of the fan, due to a clipping force of the belt-shaped elastic body.
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