What is the purpose of a chimney cap?

The primary purpose of a chimney cap is to prevent rain and debris from entering the chimney. By covering the top of the chimney flue, a chimney cap acts as a barrier against weather conditions, particularly rain, which can lead to the buildup of creosote and other harmful substances inside the chimney. Additionally, it keeps out leaves, twigs, animals, and other debris that could obstruct the flue or cause blockages, resulting in ventilation issues.

While enhancing aesthetic appeal, reducing smoke emissions, and increasing height may have certain benefits or decorative aspects, they are not the fundamental function of a chimney cap. The main goal remains to protect the interior of the chimney from unwanted elements that could compromise its effectiveness and safety.