Which component of chimney construction is designed to facilitate the movement of gases?

The flue is the component of chimney construction specifically designed to facilitate the movement of gases generated by combustion. It is a passage or duct that directs the smoke, gases, and other by-products of burning fuel safely away from the fireplace or heating appliance and out of the home. This is crucial for ensuring that harmful gases do not accumulate inside living spaces and that the combustion process operates efficiently.

An effectively designed flue helps maintain proper draft and pressure differentials, which are essential for optimal venting performance. It is typically lined with materials that can withstand high temperatures and corrosive fumes, providing safety and durability to the chimney system.

Flashing, on the other hand, is a waterproofing component that prevents water from entering the chimney structure, while the cricket is installed to divert water away from the chimney. Corbels are architectural supports that may be part of a chimney's aesthetic design but do not have any functional role in gas movement. Thus, the flue clearly stands out as the critical element aimed at removing combustion gases from a chimney system.