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A spark arrestor is a device intended to prevent combustible materials, usually sparks or other tiny flaming debris, from escaping into other areas.

They are most commonly used in conjunction with motor vehicles (inserted into the muffler), as well as improving safety within fireplaces, and various electrical wiring. Often, it mimics a net fashioned from tightly interwoven wire built to resist bits of ash, sparks, spontaneous electrical shocks, or other such dangers.

The function of the spark arrestor is to catch glowing particles which are entrained in the exhaust gas current. There are several ways to fulfill this function, the primary ones are discussed in this article.

The distinctive 'balloon stack' on early wood-burning steam locomotives contains a spark arrestor.

The spark arrestor is a part of the exhaust system and is mainly applied with diesel engines. These diesel engines for example in generator sets, ship engines and on-/offshore activities are used.

Spark arrestors are also fitted to the top of a flue (or a chimney pot) to prevent floating embers from a fire (particularly one burning wood) setting light to a flammable roofing surface (shingle, thatch, or bitumen-felt) or falling onto combustible material on the ground. Such a spark arrestor typically consists of a double layer of metal mesh, which catches the ember and allows the flue gas to escape. They are also used on the mufflers of off road vehicles. In places where forest fires can be caused by sparks from off road motorcycle and All-terrain vehicles, spark arrester may be required and Forrest rangers may cite violations.

San Dimas Technology and Development Center of USDA Forest Service is the facility that tests the spark arrestors.

With this type of spark arrestor the gases will turn around. Because the sparks (glowing particles) are heavier than the exhaust gases the particles will move themselves to the outside of the pipe under the influence of the centrifugal force. The spark arrestor ensures that the heavier particles in the barge arrive.

The vanes principle seems much on that of the crosspipe principle. The gases must pass the vanes, because the particles are relatively heavier they are swung to the outside of the spark arrestor. With this process they arrive in a spark bucket.

A fine mesh that catches any loose debris and keeps flames from exiting the muffler.