About Chimney Cowl
In recent years there has been a rise in the popularity of open fires. Old fireplaces are often opened up after years of disuse, but are often no longer fit for purpose, at least not without some attention given to the flue, which can become blocked over time. When an open fire is burning the smoke rises through the flue to be expelled in the open air at sufficient height so that it won?t cause any problems. The warm air generated by the fire will naturally rise up, taking the smoke with it. This is called an updraught. However, when a strong wind is blowing it can sometimes overcome the updraught, pushing the airflow back down the flue and into the room where the fire is set. This smoke consists of toxic fumes, so the health risk, in addition to the fire risk, is obvious.
Chimney cowls, with their anti-downdraught capabilities, are designed to address this problem. They are also useful in keeping out birds, squirrels and other animals who might take up residence in the voids, bends and missing brick spaces which can often be found in older flues. Cowls also help to prevent the ingress of rain and potential blocking factors such as leaves and other detritus, and can be used to cap off disused flues so that nothing can get inside, while allowing adequate ventilation to keep the area dry. Some of the cowl types produced are static anti-downdraught, those which spin in the wind and self adjusting models which rotate themselves away from the prevailing wind. Terracotta and stainless steel are two of the materials used in cowl construction.
Available are various used and new chimney cowls, some of which are very decorative as well as practical.