View all text of Subpart I [§ 84.110 - § 84.126]
§ 84.115 - Breathing tubes; minimum requirements.
Flexible breathing tubes used in conjunction with gas masks shall be designed and constructed to prevent:
(a) Restriction of free head movement;
(b) Disturbance of the fit of facepieces or mouthpieces;
(c) Interference with the wearer's activities; and
(d) Shutoff of airflow due to kinking, or from chin or arm pressure.