High-pressure radial ventilator for pressure-increasing conveyance of a compressible fluid with a spiral housing comprising an inlet opening for fluid intake and an outlet opening for fluid output, extending through a housing partition , and with a rotor that rotates around an axial rotational axis (D) in the spiral housing and a blading made from multiple rotor blades , whereby the blading , when the rotor is rotating, induces an axial suction of the fluid through the inlet opening and a radially and/or tangentially diverted drainage of the fluid through the outlet opening and thus a pressure-increasing conveyance of the fluid from a suction side (S) to a pressure side (P), and with a seal arrangement between the spiral housing and the rotor that serves to minimize pressure loss between the pressure side (P) and the suction side (S), whereby the rotor comprises a cover pane via which the blading is axially covered on the front side, whereby the rotor comprises a seal surface , and whereby the seal surface is positioned on an intake ring on the cover pane such that the intake ring borders an intake opening of the rotor , whereby the seal arrangement comprises a contact seal arrangement in the area of the inlet opening , whereby the intake ring extends axially toward an outer side of the housing partition through the inlet opening , whereby the contact seal arrangement comprises the seal surface on the rotor and at least one seal element touching the seal surface , whereby the contact seal arrangement seals a ring gap between an edge of the inlet opening and the rotor , whereby the seal element is removably fastened on the outer side of the housing partition , whereby the contact seal arrangement comprises a seal housing with an installation space on the outer side of the housing partition where the at least one seal element is received, characterized in that the spiral housing comprises a suction nozzle opening up into the inlet opening that radially and axially overlaps with the seal housing , and that the suction nozzle comprises an internal nozzle segment via which the seal housing is shielded against the flow of the fluid being suctioned. whereby the blading , when the rotor is rotating, induces an axial suction of the fluid through the inlet opening and a radially and/or tangentially diverted drainage of the fluid through the outlet opening and thus a pressure-increasing conveyance of the fluid from a suction side (S) to a pressure side (P), and with a seal arrangement between the spiral housing and the rotor that serves to minimize pressure loss between the pressure side (P) and the suction side (S), whereby the rotor comprises a cover pane via which the blading is axially covered on the front side, whereby the rotor comprises a seal surface , and whereby the seal surface is positioned on an intake ring on the cover pane such that the intake ring borders an intake opening of the rotor , whereby the seal arrangement comprises a contact seal arrangement in the area of the inlet opening , whereby the intake ring extends axially toward an outer side of the housing partition through the inlet opening , whereby the contact seal arrangement comprises the seal surface on the rotor and at least one seal element touching the seal surface , whereby the contact seal arrangement seals a ring gap between an edge of the inlet opening and the rotor , whereby the seal element is removably fastened on the outer side of the housing partition , whereby the contact seal arrangement comprises a seal housing with an installation space on the outer side of the housing partition where the at least one seal element is received, characterized in that the spiral housing comprises a suction nozzle opening up into the inlet opening that radially and axially overlaps with the seal housing , and that the suction nozzle comprises an internal nozzle segment via which the seal housing is shielded against the flow of the fluid being suctioned. <EOS>