What is the purpose of a chimney cap?

The primary purpose of a chimney cap is to prevent animal entry and water intrusion. By placing a cap on the top of the chimney, it acts as a barrier against various elements. It prevents animals such as birds or raccoons from nesting inside the chimney, which could block airflow and create hazardous conditions. Additionally, a chimney cap helps keep rain and snow out, which can significantly reduce the risk of water damage to the chimney structure and the surrounding areas of the home.

The cap also aids in reducing the potential for downdrafts caused by wind, which can impact the efficiency of the chimney; however, its main function fundamentally revolves around protecting the flue from external elements that could compromise its integrity and functionality. Other options, while they may seem relevant, do not address the primary protective role that a chimney cap serves.