When a factory-built fireplace is located on an exterior wall, what structure can be built around the chimney for protection?

A chase is a structure that surrounds a chimney, particularly when a factory-built fireplace is installed on an exterior wall. It serves several important purposes. Firstly, it provides protection for the chimney system from the elements, such as rain, snow, and debris, which can impact the longevity and performance of the chimney. Secondly, a chase can enhance the aesthetic appeal of the exterior of a building by allowing the chimney to blend in better with the overall design of the house.

Additionally, a chase typically helps with insulation, reducing heat loss and potential condensation issues within the chimney structure. This is particularly relevant when the chimney is exposed to lower temperatures outside. Proper construction of a chase is critical to ensure that it does not obstruct the venting of gases and that it adheres to local codes and regulations regarding clearances and materials.

Other options, while important components in relation to fireplaces, do not serve the same purpose as a chase. A flue cover is used to prevent debris from entering the flue but does not surround the chimney itself. A vent pipe is part of the venting system, designed to expel exhaust gases but does not offer the protective and aesthetic features of a chase. A hearth extension serves to protect the floor from heat and embers originating