A swivel exhaust conduit for rotatably connecting a patient mask to the delivery conduit of a positive pressure air supply. The swivel exhaust conduit design provides an exhaust port that utilizes the rotating bearing of the swivel conduit's rotating two-piece design for permitting and directing exhaust...http://www.google.fr/patents/US5937851?utm_source=gb-gplus-shareBrevet US5937851 - Swivel device utilizing bearing clearance to allow carbon dioxide laden exhaust
