CCS Fireplace Anatomy & Components Flashcards

What is the function of the smoke shelf in a masonry fireplace?

Answer: To catch falling debris and rain and prevent downdrafts from pushing smoke into the room

The smoke shelf sits just above the throat damper and acts as a barrier that catches falling debris and deflects cold downdraft air upward so it mixes with rising hot gases.

Which part of the fireplace is referred to as the 'throat'?

Answer: The narrow passage between the top of the firebox and the smoke chamber where the damper is located

The throat is the constricted opening at the top of the firebox, just above the fireplace opening, where the throat damper controls airflow into the smoke chamber.

The smoke chamber is located:

Answer: Between the throat damper and the base of the flue liner

The smoke chamber is the expanding space above the throat that compresses gases and transitions them upward into the flue liner.

What is the recommended parge coat material for smoke chambers according to NFPA 211?

Answer: A 1/2-inch or greater layer of listed refractory mortar to seal and smooth the smoke chamber walls

NFPA 211 recommends parging smoke chambers with at least 1/2 inch of listed refractory mortar to seal corbeled joints and create a smooth, efficient surface.

The fireback is the rear wall of the firebox and its primary function is to:

Answer: Reflect radiant heat into the room and protect the masonry behind the fire

The fireback reflects heat forward into the room and protects the masonry from direct flame exposure, improving both heating efficiency and durability of the fireplace.

An ash dump is located in the firebox floor and connects to:

Answer: An ash pit below the firebox where ash can be collected and removed from outside

The ash dump is a small hinged door in the firebox floor through which ash falls into a sealed ash pit below, usually accessed via a clean-out door at the base of the chimney exterior.