CCS CCS Hearth & Firebox Components 3

Question 1

What is the purpose of a hearth extension and what is the minimum front extension required by NFPA 211 for firebox openings greater than 6 sq ft?

Accepted Answer

Fire protection; minimum 20 inches in front of the firebox opening

Answer

The hearth extension protects combustible flooring from sparks and hot embers; NFPA 211 requires it to extend at least 20 inches in front of a firebox opening exceeding 6 sq ft.

Question 2

What materials are approved for constructing a hearth extension under NFPA 211?

Accepted Answer

Noncombustible materials such as brick, stone, tile, or concrete

Answer

Only noncombustible materials — brick, stone, ceramic tile, or concrete — are approved for hearth extensions to protect against dropped embers.

Question 3

What is an ash dump and how does it function in a masonry fireplace?

Accepted Answer

An opening in the firebox floor with a cast iron door that drops ash into a sealed ash pit below

Answer

The ash dump is a cast iron trapdoor in the firebox floor that allows ash to be pushed through into a sealed ash pit beneath the firebox, keeping the hearth clean.

Question 4

When inspecting an ash pit, what safety concern must a chimney sweep address if the ash pit is full?

Accepted Answer

Ash can smolder for days and an overfull pit may transfer heat to combustible subfloor framing

Answer

Ash retains heat and can smolder for 48–72 hours; an overfull ash pit risks transferring sufficient heat to adjacent wood framing to cause a fire.

Question 5

What is the lintel in a fireplace and what is its structural role?

Accepted Answer

The horizontal steel or masonry beam spanning the firebox opening that supports the masonry above

Answer

The lintel is the structural horizontal member — typically a steel angle iron or masonry arch — that spans the firebox opening and bears the weight of the masonry above.

(CCS) Certified Chimney Sweeper Practice Test

(CCS) Certified Chimney Sweeper Practice Test

CCS CCS Hearth & Firebox Components 3