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Why does NFPA 654 (section 7.13.1.6.4) prevent the use of a flame-arresting device on a clean air return line to the building and NFPA 61 allows it for the same application?

Question asked by rfoiles on Mar 31, 2017

Why does NFPA 654 (section 7.13.1.6.4) prevent the use of a flame-arresting device on a clean air return line to the building and NFPA 61 allows it for the same application?

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