| 摘要 |
A panel suction port (UI) and a panel discharge port (UO) are so formed by a lower surface panel (3) as to face each other, and are so disposed that the direction of the suction air flow (A1) sucked into the panel suction port (UI) is same as the direction of the discharge air flow (B2) discharged from the panel discharge port (UO), whereby the suction air flow (A1) and the discharge air flow (B2) can flow along a ceiling surface. |
