Have a Look at this...

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This 6" concrete flue was completely blocked by residue from smokeless fuel being washed back down the flue and collecting at one of two 45 deg. bends. I swept several 3" long bright orange 'carrots' out of the bottom of the flue, where the sulphur deposits had collected as stalactites! Photo taken with Rodtech UK system.

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Cowls - A rogues gallery.  Wrong type of cowl for the job will be at best, totally ineffective, at worst, downright dangerous.

Why fit a Birdguard Cowl?

Dis-used flues left open to the elements allow access for all sorts of things, including water...a suitable cap  prevents access from all sorts of unwanted guests.

Blocked, poorly swept or badly installed - all lead to problems, not really what you want with a fire

Pyrolosis: decomposition brought about by high temperatures

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