Any device that prevents the emission of flammable debris from combustion sources.

An engineered materials arrestor system, engineered materials arresting system, or arrester bed is a bed of engineered materials built at the end of a runway to reduce the severity of the consequences of an aircraft running off the end of a runway.

alt=Different examples of typical Flashback arrestors for different applications|thumb|Flashback arrestors with different size and flow rate, and different connections