The definition that is in Wikipedia for Spark Arrestor says this:
“A spark arrestor is any device which prevents the emission of flammable debris from combustion sources, such as internal combustion engines, fireplaces, and wood burning stoves. Spark arrestors play a critical role in the prevention of wildland fire and ignition of explosive atmospheres. As such, their use is required by law in many jurisdictions worldwide.”
Specifically for buildings, Wikipedia says this:
“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.”
As you can see, making sure that your chimney system is equipped with a spark arrestor is essential in the protection of your home. That is why you need to make sure when you speak to your chimney professional that they understand you want a chimney cap that is also rated as a spark arrestor. This will include a mesh screen that will keep flying sparks from getting out of the chimney and landing on the roof.
The great thing about these types of caps is they will also keep debris and unwanted animals out of the flue, along with protecting the system from rain entering. Making sure you understand why these items are really a necessity and not just add on features is very important to the overall safety of your family.
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