Creosote: A highly combustible material that is a
by-product of burning wood or coal which builds up on the inner wall of a chimney over time. Creosote is black or dark brown in color and usually has the texture of tar or even glass.
Crown: The sloped, concrete top of a chimney that
prevents the buildup of water around the opening. A
crown also acts as a separator between a flue liner and the inner wall of a chimney.
Damper: A retractable plate located at the throat of a
chimney. When a chimney is not in use the damper is typically left closed in order to impede the flow of air into a chimney thereby conserving energy. When a chimney is in use, the damper is left open to ensure the hazardous gases associated with a chimney are safely emitted.
Firebox: Area located in the opening of a chimney where wood is placed for burning.
Flashing: Sheet metal that is placed in the area where the roof and chimney meet. Flashing is used to form a tight seal between the roof and chimney for the purpose of keeping rainwater or any other moisture from leaking under the roof.
Flue: The passage in a chimney through which all gases are vented into the atmosphere.
Flue liner: A metal tube that is inserted in the chimney to protect the inner chimney wall and the rest of a home from the hazardous gases associated with incomplete combustion of carbon. A flue liner is typically installed in older homes that may have gases leaking out of the chimney and into the house before being vented from the flue.