What should always be checked during a chimney inspection?

During a chimney inspection, it is crucial to check the condition of the flue liner because it plays a vital role in the safe operation of the chimney. The flue liner is designed to contain the combustion byproducts, such as smoke and gases, and protect the surrounding structure from heat and corrosion. If the flue liner is damaged, cracked, or missing, it can lead to serious safety hazards such as chimney fires or harmful gases entering the home. Ensuring that the flue liner is in good condition is essential for both safety and compliance with building codes.

The other options, while they may be considered during a broader assessment of chimney functionality and safety, do not hold the same level of critical importance as the condition of the flue liner. For instance, the color of the chimney cap or the design of the fireplace does not directly affect the safe venting of gases, and the type of fuel used is more related to appliance operation than to the structural integrity and safety of the chimney itself. Therefore, checking the flue liner is a fundamental part of chimney inspection protocols.