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Understand your Flue

Class 1 Flue
Class 1 Brick Chimney
A 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.
Occasionally, a flue liner may have been used to rectify a leak. If this is the case the liner needs to have a minimum internal diameter of 180mm. If the liner has an internal dimension is only 127mm the chimney becomes Class 2.




Class 2 Pre-Fabricated FlueClass 2 Pre-Fabricated Flue
A Class 2 Pre-Fabricated 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.



Class 2 Pre-Cast FlueClass 2 Pre-Cast Flues
Class 2 Pre-Cast Flue 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.




Balanced Flue Gas FiresBalanced 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.




Powerflue Gas FiresPowerflue Gas Fires
Powerflue 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 Powerflue feature requires an electricity supply.

 






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