CCP Chimney Liner Systems & Relining 3

Question 1

Which inspection level is required before relining a chimney according to NFPA 211?

Accepted Answer

Level 2 inspection including accessible attic, basement, and video scanning of the flue

Answer

Level 1 inspection covering only visually accessible areas

Answer

Level 3 inspection requiring removal of components to gain access

Answer

No formal inspection level is required before relining

Question 2

What is the main purpose of insulating a flexible metal chimney liner during installation?

Accepted Answer

To improve draft performance and reduce condensation by maintaining higher flue gas temperatures

Answer

To protect the liner from physical damage during the installation process

Answer

To meet fire code requirements mandatory for all metal liner installations

Answer

To reduce noise transmission from the fireplace to the living areas

Question 3

According to the 3-2-10 rule in NFPA 211, what minimum height requirements apply to a chimney termination?

Accepted Answer

3 feet above the roof penetration point and 2 feet above any portion of the building within 10 horizontal feet

Answer

2 feet above the ridge and 10 feet from any exterior wall

Answer

2 feet above the highest peak of the roof regardless of proximity to other structures

Answer

10 feet above the roofline as measured from the ground level

Question 4

What physical signs on a clay tile liner indicate the tile has been damaged by a chimney fire or extreme heat event?

Accepted Answer

Honeycombing, spalling of the tile surface, glaze loss, and thermal cracking

Answer

Uniform gray discoloration and light surface staining throughout the tile

Answer

Slight darkening limited to the mortar joints between tiles

Answer

A thin layer of hardened creosote adhering to the tile surface

Question 5

When sizing a replacement metal liner for a gas appliance, what key factors and references must be used?

Accepted Answer

Appliance BTU input, total flue height, number of elbows, and venting tables from NFPA 54 or the appliance manufacturer

Answer

The original chimney construction drawings and historical BTU ratings from prior owners

Answer

Local building department schedules based on the home's square footage alone

Answer

Only the existing clay flue tile dimensions regardless of the new appliance's specifications

Question 6

What is the correct method for making the bottom connection of a flexible stainless steel liner to the appliance?

Accepted Answer

Use a listed connector tee or plate assembly with an approved appliance connector providing a sealed, accessible connection

Answer

Wrap the liner end with fiberglass tape and push it directly into the appliance flue collar

Answer

Connect directly with sheet metal screws and seal any gaps with high-temperature silicone caulk

Answer

Leave a small gap between the liner end and the appliance collar to allow natural air mixing

Question 7

What is the typical maximum number of 90-degree elbows permitted in a flexible metal liner installation according to manufacturer listings?

Accepted Answer

Two 90-degree elbows

Answer

One 90-degree elbow only

Answer

Four 90-degree elbows

Answer

No elbows are permitted in any flexible liner installation