StacksVerified U.S. regulatory reference

42 CFR §84.115

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
Flexible breathing tubes used in conjunction with gas masks shall be designed and constructed to prevent:
  1. (a)Restriction of free head movement;
  2. (b)Disturbance of the fit of facepieces or mouthpieces;
  3. (c)Interference with the wearer's activities; and
  4. (d)Shutoff of airflow due to kinking, or from chin or arm pressure.