توضیحات :
NFPA 91 – Standard for Exhaust Systems for Air Conveying of Vapors, Gases, Mists, and Particulate Solids
۲۰۲۰ Edition
Chapter 1 Administration
۱-۱* Scope.
۱-۱-۱ This standard provides minimum requirements for the design, construction, installation, operation, testing, and maintenance of exhaust systems for air conveying of vapors, gases, mists, and particulate solids as they relate to fire and/or explosion prevention, except as modified or amplified by other applicable NFPA standards.
۱-۱-۲ This standard does not cover exhaust systems for conveying combustible particulate solids that are covered in other NFPA standards (see A.1.1).
۱-۲ Purpose. The purpose of this standard is to provide technical requirements for exhaust systems that will achieve the following results:
(۱) Provide safety to life and property from fires and explosions
(۲) Minimize the damage in the event that such fires and explosions occur
۱-۳ Retroactivity. The provisions of this standard perfect a consensus of what is necessary to provide an acceptable degree of protection from the hazards addressed in this standard at the time the standard was issued.
۱-۳-۱ Unless otherwise specified, the provisions of this standard shall not apply to facilities, equipment, structures, or installations that existed or were approved for construction or installation prior to the effective date of the standard. Where specified, the provisions of this standard shall be retroactive.
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