Those of us who own or operate woodburning stoves and fireplaces face several responsibilities, one of which is to keep burning embers from escaping into the neighborhood. It only takes a few sparks in a dry area to trigger serious brush or forest fires. This is why many states require the use of a spark arrestor whenever a solid fuel fireplace or stove is in regular use.

There are actually two different types of spark arrestor one may encounter around a woodburning fireplace. The one whose use is mandated by state regulations is an open-mesh screen placed securely over the top of the chimney stack. Manufacturers have spark arrestor models in various sizes, according to the diameter of the chimney cap. This type of spark arrestor should prevent any burning embers or sparks from escaping through the chimney.

Another type of spark arrestor may be either functional or decorative. It is generally a self-supporting screen or shield placed a short distance from an open fireplace flame. It serves the same purpose as an exterior spark arrestor, keeping stray burning embers from entering the room and possibly starting a fire. Manufacturers offer reproduction spark arrestor models reminiscent of those found in castles or mansions. Of course, there are numerous functional models suitable for regular home use as well.

Experts suggest that a spark arrestor should be large enough to protect the chimney from animals and debris, but small enough to allow a positive draft in the chimney. A functional exterior spark arrestor must be regularly maintained and cleaned, like gutters or the chimney's flue. A trained chimney sweep may be able to remove the mesh screen and clean it while performing other duties. If a professional is not available, then it falls on the owners to periodically sweep out accumulated dirt, ash and leaves from their exterior spark arrestor and dust the interior version.