WAC 296-818-40005. Construction

You must make sure exhaust systems are constructed, installed, inspected, and maintained to meet both of the following: (1) The American National Standards Institute (ANSI), Z9.2-2001 for Fundamentals Governing the Design and Operation of Local Exhaust Systems; (2) The National Fire Protection Association (NFPA) 91-2004 for Exhaust Systems for Air Conveying of Vapors, Gases and Noncombustible Particulate Solids. Reference: Refer to the American National Standards Institute, ANSI Z9.4-1997 for information on Exhaust Systems for Abrasive-blasting Operations, Ventilation, and Safe Practices for Fixed Location Enclosures.