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What is a chimney liner?

By Julian Patrick

Perfectly Sized Passage

Flue 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.

flu liner

Cheap & Common

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).

This is a typical liner system

By Julian Patrick

Julian Patrick is the author of The Stovefitter's Manual and an experienced wood burning stove installer (including solid fuel heating systems).

Laid down tools in 2013 to write The Stove Fitter's Manual and open a small shop in North Wales (the Wood Stove Hut). Launched Stovefitter's Warehouse soon after due to fast growth of sales.

Own stove is a DG Ivar 5.


We will happily strive to match any price you may have from any other supplier as long as the other supplier has it in stock.
Offered an "ex-display" or "shop soiled"? We will strive to offer you a new stove for the same price.

Already have a chimney? You need 1. Stove 2. Liner 3. Fitting Pack 4. Chimney closure plate (Hardiebacker board from Builder's merchants or galvanised sheet).That's it!
No chimney? Check out our shed kits or let us design your clip-together chimney design - easy peasy.

Julian Patrick, author of the Stovefitter's Manual

Stovefitter's Warehouse is owned and managed by Julian Patrick, blogger and author of The Stove Fitter's Manual. Julian was previously a full-time installer of wood-burning stoves (including solid fuel heating systems). He laid down the tools in 2013 to write his stove manual and open a small shop in North Wales (the Wood Stove Hut, soon to grow into The Stovefitter's Warehouse).

More info about the company and Julian's team here