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This document specifies requirements for fire activated oxygen shut-off devices that stop the flow of oxygen in respiratory therapy tubing when activated by fire. NOTE 1        Typical arrangements for fire activated oxygen shut-off devices are shown in Annex C. NOTE 2        Respiratory therapy tubing is covered by ISO 17256. NOTE 3        Use of fire activated oxygen shut-off devices in medical devices or accessories is not mandated in this document. The fire activated oxygen shut-off devices specified in this document are not suitable for use with oxygen therapy systems with flows in excess of 20 l/min). NOTE 4        There is rationale for this clause in A.2. The requirements in this device-specific standard take precedence over any conflicting requirements in the general standard for airway devices (ISO 18190). All the common requirements that appear in the general standard for airway devices have been removed from this document.