[olddog]

A twin screw compressor and a roots blower are totally different technologies. Note the names compressor and blower.

Twin screw compressors are used in industry to compress air, well over 100 psi. A roots blower cannot get anywhere near that pressure. Anything a roots blower can do, a twin screw compressor will do with less hp consumed and less temp rise in the air. Not to mention the compressor can generate pressures that the roots cannot get to.