cowl
Plural
cowls
2
a loose hood or hooded robe (as worn by a monk)
3
a hood-like covering or structure, often with a conical or curved shape, used to cover or protect an opening or feature such as a chimney, ventilator, or roof
A cowl is a covering or hood-like structure placed on top of a chimney or vent to protect it from the elements and improve airflow. It helps prevent rain, snow, or debris from entering the chimney while allowing smoke or gases to escape efficiently. Cowls also reduce downdrafts, which can cause smoke to enter the building, and some designs include features that direct the airflow more effectively. They are often made from metal or durable materials to withstand weather conditions and are commonly used in homes, fireplaces, and industrial chimneys.