A compressor for compressing a fluid, comprising: a housing having an inlet for receiving the fluid and an outlet returning the fluid; a compressor mechanism adapted to compress a fluid toward the outlet , the compressor mechanism housed in the housing ; a drive unit operatively connected to the compressor mechanism for driving the compression mechanism to compress fluid; a suction duct in the housing having an inlet region arranged over the inlet of the housing, the suction duct having a sealing face about the inlet region, the sealing face being biased against an internal surface of the housing and that a bias mechanism integral with the suction duct that acts upon the housing in spaced relation to the inlet to bias the sealing face against the internal surface of the housing , the housing comprises a generally cylindrical shell section wherein the housing defines an inlet flow axis surrounded by the inlet in which flow initially enters the housing , characterized in that the suction duct comprises a ring body , and that the ring body has a maximum span in a transverse axis that is greater than a maximum span along the inlet flow axis , to cause the ring body to be squeezed along the transverse axis by the shell section , thereby creating a spring biasing force to spring bias the sealing face against the internal surface of the housing , or that the ring body has a maximum span in the inlet flow axis that is greater than a maximum span along the transverse axis , to cause the ring body to be squeezed along the inlet flow axis by the shell section , thereby creating a spring biasing force to spring bias the sealing face against the internal surface of the housing . a housing having an inlet for receiving the fluid and an outlet returning the fluid; a compressor mechanism adapted to compress a fluid toward the outlet , the compressor mechanism housed in the housing ; a drive unit operatively connected to the compressor mechanism for driving the compression mechanism to compress fluid; a suction duct in the housing having an inlet region arranged over the inlet of the housing, the suction duct having a sealing face about the inlet region, the sealing face being biased against an internal surface of the housing and that a bias mechanism integral with the suction duct that acts upon the housing in spaced relation to the inlet to bias the sealing face against the internal surface of the housing , the housing comprises a generally cylindrical shell section wherein the housing defines an inlet flow axis surrounded by the inlet in which flow initially enters the housing , characterized in that the suction duct comprises a ring body , and that the ring body has a maximum span in a transverse axis that is greater than a maximum span along the inlet flow axis , to cause the ring body to be squeezed along the transverse axis by the shell section , thereby creating a spring biasing force to spring bias the sealing face against the internal surface of the housing , or that the ring body has a maximum span in the inlet flow axis that is greater than a maximum span along the transverse axis , to cause the ring body to be squeezed along the inlet flow axis by the shell section , thereby creating a spring biasing force to spring bias the sealing face against the internal surface of the housing . <EOS>