CCS Flue Liner Types & Installation 2

Question 1

What is the primary reason cast-in-place liners are preferred for irregularly shaped flues?

Accepted Answer

They conform to the existing flue shape without requiring demolition

Answer

Cast-in-place liners are poured or pumped directly into the existing flue, conforming to irregular shapes and filling voids without major demolition.

Question 2

Which NFPA standard governs the installation of factory-built chimneys and their liners?

Accepted Answer

NFPA 211

Answer

NFPA 211 is the Standard for Chimneys, Fireplaces, Vents, and Solid Fuel-Burning Appliances, covering liner installation requirements.

Question 3

A homeowner reports that their stainless steel liner shows heavy pitting after two years of use with an oil-fired appliance. What is the most likely cause?

Accepted Answer

An incorrect alloy grade was used for oil appliance flue gases

Answer

Oil appliances produce sulfuric acid condensate that requires a higher-grade alloy; using 316Ti or 316L instead of 304 stainless prevents pitting corrosion.

Question 4

When sizing a liner for a wood-burning fireplace, the cross-sectional area of the liner should generally be at least what fraction of the fireplace opening area?

Accepted Answer

1/10

Answer

A common guideline is that the flue cross-sectional area should be at least 1/10 of the fireplace opening area to ensure adequate draft.

Question 5

What does the term 'listed' mean when applied to a flexible stainless steel liner system?

Accepted Answer

The liner has been tested and certified by a recognized testing laboratory

Answer

A listed product has been evaluated by an accredited testing laboratory such as UL and meets published safety and performance standards.

(CCS) Certified Chimney Sweeper Practice Test

(CCS) Certified Chimney Sweeper Practice Test

CCS Flue Liner Types & Installation 2