Why put a cowl on a chimney?
There are four main reasons why a chimney cowl is often a good idea:
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To improve draw
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Anti-downdraught
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Animal-proofing
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Weather-proofing
What causes downdraught in chimneys?
In an optimally-working chimney, warm gases released from a burning fire will carry smoke up the chimney flue. But environmental factors, such as a home in high terrain or poor construction of the chimney, can let strong winds in which then push the smoke back down.
How can I improve my chimney draught?
The ultimate way to ensure that a problem with chimney downdraught is solved is to install an appropriate anti-downdraught chimney cowl. This will ensure that smoke flow up the chimney and keep the fire burning beautifully and safely.
A wind-directional cowl is best for relieving downdraught, whilst a rotating cowl is usually the best option for ventilation purposes.
Cowls are manufactured according to flue pipe sizing