CCP Chimney Liner Systems & Relining 1 — Questions and Answers
Question 1: What is the primary purpose of a chimney liner?
- To improve the appearance of the chimney interior
- To protect the surrounding structure from heat and combustion gases while providing a properly sized flue (Correct answer)
- To prevent animals from entering the chimney
- To reduce the weight load on the chimney structure
Correct answer: To protect the surrounding structure from heat and combustion gases while providing a properly sized flue
A chimney liner protects the house structure from heat and combustion byproducts while providing a correctly sized passageway for efficient draft and safe venting.
Question 2: According to NFPA 211, what are the three main categories of approved chimney liners?
- Brick, concrete, and metal
- Clay tile, metallic, and cast-in-place (Correct answer)
- Ceramic, aluminum, and fiberglass
- Masonry, prefabricated, and spray-on
Correct answer: Clay tile, metallic, and cast-in-place
NFPA 211 recognizes clay or terra cotta tile, metallic liners, and cast-in-place liners as the three approved categories for chimney lining systems.
Question 3: What NFPA standard is the primary reference for chimneys, fireplaces, vents, and solid fuel-burning appliances?
- NFPA 31
- NFPA 54
- NFPA 211 (Correct answer)
- NFPA 101
Correct answer: NFPA 211
NFPA 211 is the Standard for Chimneys, Fireplaces, Vents, and Solid Fuel-Burning Appliances, which governs liner requirements and installation standards.
Question 4: What is the minimum wall thickness required for clay flue tiles used in residential chimney liners?
- 1/4 inch
- 3/8 inch
- 5/8 inch (Correct answer)
- 1 inch
Correct answer: 5/8 inch
NFPA 211 requires clay flue tiles to have a minimum wall thickness of 5/8 inch to provide adequate thermal protection and structural integrity.
Question 5: When converting a wood-burning fireplace to a gas appliance, why is a metal liner typically required?
- Gas appliances produce higher temperatures than wood fires
- Gas combustion produces acidic condensate that deteriorates clay tile over time (Correct answer)
- Metal liners are required by all local building codes regardless of fuel type
- Clay tiles cannot withstand the vibration from gas burners
Correct answer: Gas combustion produces acidic condensate that deteriorates clay tile over time
Gas appliances operate at lower flue temperatures and produce acidic condensate that accumulates and deteriorates clay tile liners, making a corrosion-resistant metal liner necessary.
Question 6: Which stainless steel grade is most appropriate for lining a chimney connected to an oil-burning appliance?
- 201 stainless steel
- 304 stainless steel
- 316L stainless steel (Correct answer)
- 430 stainless steel
Correct answer: 316L stainless steel
316L stainless steel has superior resistance to the sulfuric acid condensate produced by oil combustion, making it the correct choice for oil-burning appliance flues.
Question 7: What does the term 'continuous liner' mean in the context of chimney relining?
- A liner that operates 24 hours a day without interruption
- A liner that runs the full length of the flue from appliance connection to termination without unlined gaps (Correct answer)
- A liner installed in multiple connected sections using approved joints
- A liner made from a single unbroken piece of material with no seams whatsoever
Correct answer: A liner that runs the full length of the flue from appliance connection to termination without unlined gaps
A continuous liner runs the entire length of the chimney flue from the appliance connection point to the chimney termination without any unlined sections or gaps.
CCP Chimney Liner Systems & Relining 1
What is the primary purpose of a chimney liner?