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2024 International Residential Code
Chapter 18

IRC 2024

2024 International Residential Code

Chapter 18Chimneys And Vents

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Question 1 1.

Which of the following fuel-burning appliances is NOT required to be vented to the outdoors?

Gas-fired furnace
Oil-burning water heater
Wood-burning stove
Appliances listed and labeled for unvented use

Question 2 2.

What is the primary objective of a venting system regarding draft requirements?

To prevent back drafting into the living space.
To ensure complete combustion of fuel.
To develop a positive flow to convey combustion products to the outside atmosphere.
To maintain a constant temperature within the appliance.

Question 3 3.

When an appliance is permanently disconnected from an existing chimney or vent, or connected during a new installation, which of the following is NOT a required compliance step?

The chimney or vent shall be resized as necessary.
The flue passageway shall be free of obstructions.
The entire chimney or vent system must be replaced.
The chimney or vent shall have airspace clearance to combustibles.

Question 4 4.

When resizing an existing masonry chimney for an oil-fired appliance, what standard must be followed?

IRC Chapter 24
NFPA 31
UL 1777
Manufacturer's instructions only

Question 5 5.

An existing flue passageway was previously used for venting a solid fuel-burning appliance. Before connecting a new gas appliance, what specific action is required?

The flue liner must be replaced with a Type L vent.
The flue passageway must be cleaned of combustible deposits.
A mechanical draft system must be installed.
A new cleanout opening must be added.

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