| 摘要 |
The fan (1) has ring portion (9) which connects each edge portion of blades (8) positioned in cylindrical form. A discharge outlet (5) formed in wall surface is positioned such that circumference of the fan is covered. A spiral air flow path is formed between wall surface and the fan by fan casing (3). The air of the swirl shape which flows through the air flow path is discharged from the discharge outlet. A recessed portion (13) formed in the tongue portion (6) vicinity of the fan casing opposes the ring portion toward the outer side from the fan casing. |
