This part of ISO 10079 specifies basic safety and performance requirements for medical suction equipment powered from a vacuum or positive pressure gas source generating venturi suction. It applies to suction equipment connected to medical gas pipeline systems or cylinders and venturi attachments and can be stand-alone or part of an integrated system. ISO 10079 Part 4 specifies general requirements for all medical suction equipment covered by the ISO 10079 series and is used as the basis for this Part 3. The exemptions listed in ISO 10079-4, Clause 1, shall apply.