Chimney Anatomy - What does that mean?

September 7, 2018
William Hussel


Concrete Cap - A concrete cap or crown, is the concrete piece that rests at the top of your chimney to protect the masonry from water and weather damage.

Rain Cap – This is a metal, usually stainless steel cap that prevents water from entering the flues or liners.

Flue – Empty space inside your chimney that allows combustion gases to vent.

Flue lining – Stainless steel lining system for venting.

Chase Cover – Stainless steel cover for the top of wood or sided chases, not masonry.

Smoke Chamber – To gently compress the byproducts of combustion into a smaller space (the chimney) without causing backdraft. The use of sloping walls, in conjunction design and maintenance.

Damper – Lever or pulley activated doors within your chimney that can be closed to prevent energy loss when your fireplace isn’t being used.

Smoke Shelf – Located right behind the damper to catch falling debris and rain water and to help with the transition of large volumes of smoke into the small chimney.

Lintel – This piece is placed just above the fireplace opening and are used in archway, door and window openings to help bear the load created by opening such spaces.

Throat – The space just below the damper and above the firebox.

Ash Dump / Pit – Where you put your ashes when you clean out the firebox and must be emptied.

Firebrick – The brick that lines the firebox.

Mantle – Generally a piece of wood or limestone that outside of the fireplace and above it for clearances.

Hearth – Goes outside of the fireplace and below it for clearances.

Fireplace Facing – This is that material you have your fireplace finished with.