This sound enclosure contains a compressor and an air cooler. An electric louver is provided at the blow-off end of the air cooler and is interlocked with opening/closing control of the air cooler. A dissipative silencer is set at the blow-off port. The electrical part is equipped with explosion-proof lighting, fire alarm control box, etc., and the overall sound insulation of the sound enclosure is not less than 35dB (A).