PURPOSE: To make cooled air blown off from outlet members uniformly diffuse into a whole room at a velocity imperceptible for a worker by providing cloth- made cylindrical outlet members and inlets in the vicinity of a ceiling.

CONSTITUTION: An air conditioning apparatus for a low temperature factory dealing with food, meat and the like provides a production line with an air- conditioned region of low temperature (10-18°C) inhibiting the contamination of the production line by miscellaneous germs, etc., and makes cooled air uniformly diffuse at a velocity of down flow caused by the specific gravity difference between the cooled air and the ambient air in order to prevent the drop of the feeling temperature of a worker. In the air conditioner of this invention, cloth-made cylindrical outlet members 14 are arranged in the vicinity of a ceiling 15, and the cooled air is blown off at a very low velocity of e.g. 0.05-0.1m/s from the outlet members 14. A required number of inlets 17 are provided, in the vicinity of the ceiling 15, at positions above intermediate parts of neighboring two of the outlet members 14. In such an arrangement, the downflow air is not accelerated by suction air flow so that the cooled air can be made to uniformly diffuse into the room.