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.