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Aluminum Liner - Aluminum can be used as a relining pipe, when relining flues for low-efficiency gas furnaces or water heaters. These devices produce neither enough heat nor enough moisture to constitute the need for a more durable stainless steel relining pipe.

Andiron - Andiron or firedog, is a bracket support, normally found in pairs, on which logs are laid for burning in an open fireplace, so that air may circulate under the firewood, allowing better burning and less smoke. Much like a fireplace grate.

Ash - The white/grey powdery residue left when combustible materials such as wood and other biomass is burned.

Ash Dump - An opening located at the bottom of the fireplace, through which ashes can be dumped. Often, there is a door covering the opening.

Ash Pit - A storage compartment for ashes, located underneath the ash dump. It is usually quite large and should have a access door for cleaning out the ashes periodically.