Define the term "smoke shelf."

The term "smoke shelf" refers to the horizontal surface found within a chimney that serves an essential function in capturing soot and debris that may fall from the flue. This shelf is typically located above the damper and below the smoke chamber. Its primary purpose is to allow the smoke and gases generated from burning materials to rise into the chimney while preventing excess debris from entering the flue system. By collecting falling soot, the smoke shelf helps maintain a more efficient chimney system and reduces the risk of blockage, which can lead to chimney fires or poor ventilation. Understanding the role of the smoke shelf is crucial for maintaining chimney safety and performance.