Denair Shanghai denair Compressor Co. the company headquarters is located in the city of Cologne Germany's Westfalen Germany denair group, is a German machinery enterprises, since the 1875 developed the first refrigerantcompressor, R & D and production has been working gas compressors,Germany in the gas compression is one of the three major brands, its products include double screw air compressor, turbine, compressor, drill, drill hole submersible vehicles etc..