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How Should I Flue My Stove?

Making sure your flue installation is correct is one of the most important factors when looking to buy and install a new stove.

Chimney

Today it is no longer essential to have a chimney if you would like to install a new fire. A chimney is used to guide smoke and fumes safely away from the fire, however it is now possible to install a gas or oil fire with an outside flue or alternatively an electric fire which does not require a flue.

A chimney suitable for all flue fires is usually made from stone or brick and runs up through your house or up along an outside wall. However, if not, a chimney can be built from an insulated stainless steel rigid fuel liner, which again, can be built up through your house or up along an outside wall. Older or damaged stone or brick chimneys, can still be used , but will need lining inside with an insulated flexible stainless steel liner from top to bottom.

If you are unsure we recommend you have your chimney inspected by a chimney sweep, who will assess the condition and recommend the appropriate action. It is also recommended that you have your chimney swept if you intend to use it. To find a chimney sweep in your area, enter your town in the box to the right and click the 'Find' button. If none are found try entering the name of a larger town nearby. If you don't have a chimney and don't wish to install one, you can install a flue to enable a gas or oil fire to be used in your home. This involves making a small flue hole in an outside wall and installing a powered/balanced flue. These are discreet, quiet and weatherproof, being acoustically dampened to minimise noise from the fan. To install a powered/balanced flue you will need to:

Position your fire backing onto an outside cavity wall. Ensure to wall is between 300 and 500mm thick. Ensure there are electricity supplies nearby (for powered flue).

Flue Diameter

The flue diameters given relate to the internal flue diameter and are calculated by the manufacturer of the stove.

Conventional flued stoves: This is the the minimum size flue that the stove can use - you must not reduce the size of the flue used.

Balanced Flue: Most balanced flue gas stoves will have an internal flue diameter of 125mm (5"), however the external diameter will generally be 50 - 75mm (2 - 3") greater.

Flue Outlet

Most stoves have an interchangeable flue outlet, in which case you will have one flue collar for the outlet you are going to use and one blanking disc for the unused outlet. These two items can be switched around allowing you to decide on your flue configeration after you have bought your stove or to change the set up in the future. However, there are a small number of models which do not have an interchangeable outlet. When deciding how to flue your stove, please remember:

Top: The flue pipe will travel up to a spigot plate or through a register board. It is advisable to incorporate an adjustable length of flue pipe to enable easy removable of your stove in the future.

Rear: If using the rear flue outlet, the flue pipe must travel no further than 150mm horizontally before turning vertically. In the case of a gas stove a 90 degree bend can be used, whilst in the case of wood or multi-fuel stoves, a cleaning door must be provided - we suggest using a 90 degree tee with cap.

In both cases fire cement should be used to seal the flue pipe to the flue collar on the stove.