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Standard for Exhaust Systems for Air Conveying of Vapors, Gases, Mists, and Particulate Solids

This standard provides technical requirements for exhaust systems that will protect lives and property from fires and explosions and minimize damage in the event that such fires and explosions occur.

Please note:  This Standard is no longer accepting Public Input due to the Combustible Dust Document Consolidation Plan (consolidation plan) as approved by the NFPA Standards Council.  As part of the consolidation plan, this Standard is slipping cycle and being combined into a new consolidated draft.  Once the new draft is available and open for Public Input, this notice will be updated with a link to the applicable document information page.

Current Edition: 2020

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NFPA 91

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