Which type of structure is created around an exterior chimney to provide additional protection?

The term "chase" refers to a structure built around an exterior chimney that serves to protect it from the elements and enhance its appearance. A chimney chase is typically constructed of materials similar to those used for siding on the rest of the house, which can help prevent moisture intrusion, provide insulation, and improve the overall aesthetic of the chimney.

The chase may also house insulation and other utility elements while allowing for the safe passage of exhaust gases through the chimney flue. By protecting the chimney from weather-related damage, the chase contributes to the longevity and functionality of the chimney system.

Other options might refer to different components or features related to chimneys, but they do not accurately describe a structure created specifically for surrounding an exterior chimney.