PURPOSE: To adjust air flow to an arbitrary direction by remote control and improve operational efficiency and work environment.

CONSTITUTION: A box-like body 33 to which an air feed duct 35 is connected is installed in ceiling in such a way that its lower surface is exposed through the surface of the ceiling 31. An air outlet opening 37 in the ceiling surface 31 is formed at the lower surface of the box-like body 33. The air outlet opening 37 is provided with a damper 39 for adjusting the area of the air outlet opening and a plurality of vanes 41 for adjusting the air outlet directions. The box-like body 33 is provided with a damper 39 and a driving part 43 for driving the vanes 41. A remote controlling device 49 which is connected to the driving part 43 through a control line 51 to drive and control it is provided in an air supply area S.