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NFPA 664

Question asked by bobwhiterwi on Oct 20, 2017

NFPA664 (dust collector less than 5,000CFM) states:    "connected directly to a listed spark extinguishing system.

NFPA664 (dust collector more than 5,000CFM) states:   " equipped with a listed spark detection system"  nothing is said about extinguishing.  Is this an over sight?  What is the intent?  Does this assume a "listed spark detection system" includes extinguishment?