Flue liner, chimney liner?

flu linerFlue liner is actually a stainless steel flexible tube that is used to line the inside of a chimney to provide a robust and perfectly-sized passage for the combustibles from a solid fuel appliance (e.g. wood burning or


multifuel stove).

Definition: If the chimney is a Polo mint then the flue is the hole.

A flexible flu liner, stop it… flue liner (or “flexi” or “liner”) is a flexible stainless steel tube that is connected to the top of the pipe protruding from your wood burning stove and at the other end within the chimney pot (or attached directly to the cowl).

It can be seen from this that smoke (and property damaging acids and tar) never come into contact with the inner walls of your chimney and can therefore also not escape through old/damaged building material and into the property where it can be a danger to occupants. A chimney liner may benefit from insulation.

There are other methods of lining your chimney other than to fit a chimney flue liner but a flue liner is by far the cheapest and most common.A flue liner is not supposed to be in place of a suitable chimney or used if a chimney has fallen into a poor state of repair (if the chimney has faults they should be repaired professionally before lining).


Flue liners are usually 5″ or 6″ diameter but can be larger. They are made of stainless steel in varying degrees of quality (316 grade or 904 grade with the 904 being higher quality).

Typical liner system

This is a typical chimney lining showing the parts you need to order (£375 for all the above exc. stove assuming 8m 6″ liner and assuming high-quality and easy-fit parts throughout): hanging cowl connects directly to liner using a jubilee clip (liner “hangs” from cowl), liner, adaptor (connects liner to black vitreous stove pipe using integral bolts at liner end and you use self tapper screws at vitreous end). The cover plate is a small plate that allows the vitreous to pass through the chimney-sealing-closure-plate in a neat and tidy manner. Note that there are other cowls rather than hanging cowls and you should read the relevant sections of this site for the fullest of information.



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