InterNACHI Fireplaces, Chimneys & Solid Fuel Appliances

Question 1

What is the minimum height a masonry chimney must extend above a flat roof or a roof with a pitch less than 2:12?

Accepted Answer

3 feet above the roof penetration point

Answer

2 feet above the highest point within 10 feet

Answer

18 inches above the ridge line

Answer

4 feet above the roofline at all points

Question 2

Creosote found in a chimney flue is a byproduct of:

Accepted Answer

Incomplete combustion of wood in a fireplace or stove

Answer

Moisture condensation on cold masonry surfaces

Answer

Sulfur deposits from burning natural gas

Answer

Oxidation of the cast-iron firebox liner

Question 3

What is the primary purpose of a chimney damper?

Accepted Answer

To seal the flue when the fireplace is not in use

Answer

To increase the draft velocity through the flue

Answer

To support the chimney liner against thermal movement

Answer

To prevent downdrafts from entering the combustion chamber

Question 4

According to InterNACHI standards, which component on a chimney directs water away from the junction of the chimney and a sloped roof?

Accepted Answer

Saddle (cricket)

Answer

Flashing and counter-flashing

Answer

Chimney cap with drip edge

Answer

Weep screed

Question 5

What is the most common material used to line a masonry chimney flue in residential construction?

Accepted Answer

Clay tile (terracotta)

Answer

Stainless steel flex liner

Answer

Poured-in-place refractory

Answer

Cast-iron segmented liner

Question 6

A chimney cap serves which of the following primary functions?

Accepted Answer

Preventing rain, debris, and animals from entering the flue

Answer

Increasing updraft velocity to improve combustion

Answer

Reducing thermal expansion stress on the chimney crown

Answer

Meeting code requirements for spark arrestor clearance

Question 7

When inspecting a fireplace firebox, which condition would an InterNACHI inspector flag as a safety deficiency?

Accepted Answer

Cracks in the refractory firebrick panels exceeding 1/8 inch

Answer

Soot staining on the back wall above the damper shelf

Answer

Ash pit door located below the firebox floor level

Answer

Presence of a glass-door screen assembly