A chimney cowl is a cap or rotating ventilator used in the top of the flue pipe to protect from the rain water get inside to Fire place. More over it is used to prevent the back flow of smoke by wind and also this can protects the system from pest and animals such as rats, birds, squirrels and others to get inside.
www.edocr.com/doc/144192/understanding-right-chimney-cowl
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