Atmospheric Vents : All points where pipes, stacks, or ducts are open to the atmosphere, including discharge points from emissions control devices, vent pipes from safety valves, vent pipes from filters or pumps, and other vents
NFPA 560 Standard for the Storage, Handling, and Use of Ethylene Oxide for Sterilization and Fumigation, 2007 ed. (Std: Storage, Hndlg, and Use of Ethylene Oxide for Sterilization and Fumigation - Amer) {333 NFC}