StacksVerified U.S. regulatory reference

21 CFR §868.5870

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
  1. (a)Identification. A nonrebreathing valve is a one-way valve that directs breathing gas flow to the patient and vents exhaled gases into the atmosphere.
  2. (b)Classification. Class II (performance standards).