CCS Fireplace Anatomy & Components Flashcards

The combustion air requirement for a wood-burning fireplace in a modern tightly-sealed US home is best addressed by:

Answer: Installing a dedicated outside air supply duct to the firebox

Modern airtight construction restricts infiltration, so a dedicated outside air supply duct provides the combustion air the fireplace needs without depressurizing the living space.

What is the lintel in a masonry fireplace?

Answer: The horizontal stone or steel beam spanning the top of the firebox opening to support the masonry above

The lintel is the horizontal structural element spanning the top of the firebox opening, carrying the weight of the masonry above the fireplace opening.

The hearth extension in front of a fireplace opening is required by NFPA 211 primarily to:

Answer: Protect the combustible floor from hot embers and rolling logs

NFPA 211 requires a non-combustible hearth extension to protect the floor area in front of the fireplace from falling embers, sparks, and rolling logs.

According to NFPA 211, the minimum hearth extension depth in front of the fireplace opening for a firebox opening larger than 6 square feet is:

Answer: 20 inches

For firebox openings larger than 6 square feet, NFPA 211 requires the hearth extension to extend at least 20 inches in front of the opening to adequately protect the floor.

A fireplace insert is installed inside an existing masonry fireplace and must be connected to the flue by:

Answer: A listed rigid or flexible liner that runs from the insert's collar to the top of the chimney

NFPA 211 requires a listed liner running from the insert's flue collar to the top of the chimney to ensure safe venting and prevent gases from entering the smoke chamber or masonry.

Which component of a gas fireplace prevents room air from being used for combustion and exhausted gases from entering the living space?

Answer: The sealed glass front with a direct vent system using co-axial pipes

Direct vent gas fireplaces use sealed glass fronts and co-axial (pipe within a pipe) venting to draw combustion air from outside and exhaust gases to outside, keeping room air completely separate.