NFPA 91 Standard for Exhaust Systems for Air Conveying of Vapor, Gases, Mists & Non-combustible Particulate Solids, 2015 Edition.
NFPA 91: Standard for Exhaust Systems for Air Conveying of Vapors, Gases, Mists, and Noncombustible Particulate Solids provides minimum requirements for the design, construction, installation, operation, testing, and maintenance of these systems except as modified or amplified by other applicable NFPA standards.
The NFPA 91 is essential for process industries in which there is production or release of gases, vapors, or solids that are pneumatically conveyed through duct systems; design engineers; fire protection engineers; safety and health professionals; industrial hygienists; and fire and building officials.
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