The apparatus is equipped with cover unit (1) fixed to a head portion of worker so as to cover at least the regions of nose and mouth of the worker, the cover unit capable of trapping the workers breath. The cover unit has an exhaust opening and an air supply opening. Further, the apparatus is equipped with moisture recycle unit (2) fitted to the worker so as to simultaneously carry out the two processes consisting of the adsorption process of introducing moist air, effecting adsorption of the water contained in the air on an adsorbent and emitting dry air and the regeneration process of introducing dry air, effecting evaporation of the water adsorbed on the adsorbent into the dry air and emitting moist air. Still further, the apparatus is equipped with exhaust hose (3) connecting the exhaust opening of the cover unit to the moisture recycle unit and with air supply hose (4) connecting the moisture recycle unit to the air supply opening of the cover unit. The exhaust from the cover unit (1) is emitted via the moisture recycle unit into the dry room as dry air, and the dry air within the dry room is fed via the moisture recycle unit into the cover unit as moist air.
