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Chimney Types & Flue Types

The type of chimney or flue you have dictates the type of fire you can have. But if you’re not sure, then take a look at your roof and compare it with the simple guide below.

It’s worth remebering that a full depth fire often requires a traditional chimney or rebate on the fire surround, whilst a slimline fire will fit virtually and chimney or flue.

Brick Chimney

Class 1 Flue

Is easily recognised by a conventional brick chimney with chimney stack on the roof. This relies on the natural ‘pull’ to expel the products of combustion out of the chimney pot. The minimum internal diameter for class 1 is 180mm. This allows you to have most types of fires.

Pre-Fabricated Flue

Class 2 Flue

Is a metal flue box that is situated behind the fire connecting to a series of metal flue pipes running up through the house terminating with a pipe and terminal through the roof. The internal diameter of the pipe is 127mm. There are a large number of fires available for this situation. Occasionally, the flue may have been constructed using 180mm pipe. If this is the case, the flue is classed as Class 1.

Pre-Cast Flue

Class 2 Flue

These are commonly found in more modern homes. Constructed using hollow concrete flue blocks which create a flue up through the property usually terminating with a ridge vent on the roof. In most cases there is usually a flat wall where ther fire goes. This does limit slightly the choice of fires suitable as depth can be an issue.


Can’t see a chimney or a flue?

If you Can’t see a chimney or a flue like the ones described above, then you will require either a Balance Flue, a Power Flue or an electric fire.

Power Flue

Gas Fires

Power Flue Gas Fires expel the flue gases directly outside the building through the use of an electronically driven fan unit mounted on the external wall.

A sophisticated microprocessor monitors performance and automatically shuts off the fire in the unlikely event of operation failure. The fan eliminates the need of a glass front. Availble on both inset and outset gas fires the Power Flue feature requires an electricity supply.

Balanced Flue

Gas Fires

Either inset or outset, these fires have been designed for homes without a chimney or flue. All Balanced Flue Gas Fires are glass fronted. They vent directly outside through a horizontal co-axial pipe (one pipe within a larger pipe). The outer pipe draws air in from the outside and the inner pipe expels combustion gases. An electricity supply is not required for these products.


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