Protective Housing : An enclosure that surrounds the laser or laser system that prevents access to laser radiation above the applicable maximum permissible exposure (MPE) level
NFPA 59A Standard for the Production, Storage, and Handling of Liquefied Natural Gas (LNG), 2009 ed. http://www.giignl.org/sites/default/files/PUBLIC_A REA/About_LNG/4_LNG_Basics/lng_4_-_operational_int egrity_7_3_09-aacomments-aug09.pdf, (Std: Prod, Storage, and Hndlg of LNG - Amer) {215 NFC}