Section 868.5560 - Gas mask head strap(a)Identification. A gas mask head strap is a device used to hold an anesthetic gas mask in position on a patient's face.(b)Classification. Class I (general controls). The device is exempt from the premarket notification procedures in subpart E of part 807 of this chapter subject to the limitations in § 868.9 .47 FR 41107, Sept. 17, 1982, as amended at 54 FR 25048, June 12, 1989; 66 FR 38795 , July 25, 2001