title: An expired gas collection and disposal system.
abstract: An expired gas collection and disposal system based on an independent suction pump is described. The halothane concentration in the atmosphere was measured, with and without the system. The increase of halothane concentration was limited to 1 p.p.m. above the theatre basal value with the system in use, and 5 p.p.m. when no venting was used.
mesh_terms: D000397:Air Pollution / Q000517:prevention & control*; D000766:Anesthesia, Dental / Q000295:instrumentation; D000769:Anesthesia, Inhalation / Q000295:instrumentation*; D004526:Efficiency; D006221:Halothane / Q000032:analysis*; D006801:Humans; D012134:Respiratory Protective Devices; D014691:Ventilation
chemical_list: D006221:Halothane