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Abort gates are used on the clean air discharge of a dust collector to divert a flame front from entering the building according to National Fire Protection  Association (NFPA) standards requirements. 

In normal operation the diverter plate is raised into the armed position allowing the clean air to pass straight though the abort  gate.  When the gate receives an alarm signal from the spark detection control panel, the diverter plate is released and drops down causing the air flow to be diverted from the normal straight through path making a U turn to divert the flame front to atmosphere.