Clean room

A clean room for keeping clean interior air of an airtight main room by circulating the interior air through a circulation path and an air conditioner and filters disposed in the circulation path, which clean room comprises:

• a plurality of gate-shaped frames disposed in prescribed directions and regularly spaced on a floor surface;
• an air-conditioning unit built in at least one of the spaces between the adjacent vertical members of the gate-shaped frames
• a control unit built in one of the spaces between the adjacent vertical members other than the space occupied by the air-conditioning unit and adapted for controlling the air-conditioning unit, the air-conditioning unit being provided with an external casing of low thickness, the external casing having at the lower interior wall thereof an air inlet and at the upper interior wall thereof an air outlet fitted with a high-performance filter, the casing having therein an air blower, the air-blower being so adapted as to deliver forced air flow to the air outlet, and the control unit being disposed in a thin external casing for accommodating mechanical control items;
• wall panels covering the spaces between the adjacent vertical members of the gate-shaped frames other than those occupied by the air-conditioning unit and the spaces between the vertical members of the gate-shaped frames and wall panels covering the exterior of the gate-shaped frames positioned outside the room;
• a ceiling panel covering the upper open end of the room enclosed by the wall panels;
• and
• means for tightly sealing the clean room.