Abstract: A post-operative anaesthesia recovery apparatus that permits anaesthetic waste gases exhaled by a patient to be withdrawn and discharged outside the unit. The apparatus includes a face mask having a recovery port and an oxygen port. The oxygen port allows oxygen to be fed to the patient. The recovery port is attached to a suction evacuation assembly, which is in turn attached to a discharge assembly. An air entrainment cartridge attaches the evacuation assembly to the recovery port. The cartridge is provided with longitudinal channels that allow a flow of air into the apparatus. The entrained air maintains a slightly sub-atmospheric pressure within the apparatus and allows the patient to breathe normally without complex valve systems.