Chimney Liner Systems & Relining Flashcards
7 cards from real CCP practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Chimney Liner Systems & Relining flashcards as text
Which inspection level is required before relining a chimney according to NFPA 211?
Answer: Level 2 inspection including accessible attic, basement, and video scanning of the flue
NFPA 211 requires a Level 2 inspection before relining, which includes video scanning of the complete flue interior to fully assess the chimney's condition and suitability for the relining method chosen.
What is the main purpose of insulating a flexible metal chimney liner during installation?
Answer: To improve draft performance and reduce condensation by maintaining higher flue gas temperatures
Insulating a metal liner keeps flue gases at higher temperatures as they travel up the chimney, which improves draft efficiency, reduces acidic condensation, and extends liner service life.
According to the 3-2-10 rule in NFPA 211, what minimum height requirements apply to a chimney termination?
Answer: 3 feet above the roof penetration point and 2 feet above any portion of the building within 10 horizontal feet
NFPA 211's 3-2-10 rule requires chimneys to extend at least 3 feet above the highest point where they pass through the roof and at least 2 feet above any portion of the building within 10 horizontal feet.
What physical signs on a clay tile liner indicate the tile has been damaged by a chimney fire or extreme heat event?
Answer: Honeycombing, spalling of the tile surface, glaze loss, and thermal cracking
Honeycombing, spalling, loss of the protective glaze, and thermal cracking are the hallmark signs that clay tiles have been subjected to the extreme heat of a chimney fire.
When sizing a replacement metal liner for a gas appliance, what key factors and references must be used?
Answer: Appliance BTU input, total flue height, number of elbows, and venting tables from NFPA 54 or the appliance manufacturer
Proper liner sizing for gas appliances requires applying NFPA 54 venting tables or manufacturer specifications that account for BTU input, total flue height, and any elbows or offsets in the liner run.
What is the correct method for making the bottom connection of a flexible stainless steel liner to the appliance?
Answer: Use a listed connector tee or plate assembly with an approved appliance connector providing a sealed, accessible connection
The bottom connection must use a listed tee or plate assembly that creates a proper sealed connection to the appliance connector while providing required cleanout access as specified in the liner's listing.
What is the typical maximum number of 90-degree elbows permitted in a flexible metal liner installation according to manufacturer listings?
Answer: Two 90-degree elbows
Most listed flexible liner systems permit a maximum of two 90-degree elbows (or equivalent offset), as additional bends significantly reduce draft performance and may void the product listing.