Damper, Smoke 2 : A duct-closure device that is operated automatically or manually, including manual remote, and that is designed to restrict the spread of smoke through the ductwork
NFPA 301 Code for Safety to Life from Fire on Merchant Vessels, 2001 ed. https://www.nfpa.org/Assets/files/AboutTheCodes/30 1/301-A2012-ROP.pdf, (Code: Life Sfty from Fr on Merchant Vssl - Amer) {291 NFC}