A pneumatically-powered device that is a component of an anaesthesia workstation and connects between the expiratory valve or port of a breathing circuit and the extraction system enabling the waste anaesthetic, exhaled, or other trace gasses to be removed under controlled conditions from the work environment and channelled to the outside of the building. Filters or absorbers may be required to clean the removed gasses before discharging to the atmosphere. This device is also known as an anaesthetic gas scavenging system (AGSS).
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