Anesthetic gas scavenging systems (AGSS) are designed to remove by active suction system the exhaled anaesthetic gas mixtures from the atmosphere of operating theatres, anaesthetic and awakening rooms conveying them outside the building. This way, the long-term health risks, caused by anesthetic vapour pollution, to which surgeons and nurses are exposed to, decrease substantially. The advantage of this system, compared to a conditioning system, lies in the possibility of locating the aspiration directly on the source of pollution: the anesthetic device or the patient himself.