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Our Guide To Chimney & Flue Types

At First Choice Fireplaces we know it can be confusing to work out which chimney or flue type you have. We offer a standardised key approach to categorise our fires in a way that is easy to understand. These icons indicate the chimney or flue type that each fire is suitable for.

Icon Type Identifying Features What this means
No Chimney or Flue No Chimney or Flue A flat roof, no present chimney opening. The easiest fire to install, these products do not require a chimney or flue.
Brick Chimney Brick Chimney

These chimneys are easily recognised by a raised stack topped with either a teracotta pot or gas terminal. 

 This type of chimney relies on the natural circulation of heated air to expel the products of combustion up your chimney.
Balanced Flue Balanced Flue A horizontal flue venting directly outside.

No chimney required. Balanced Flue fires 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.

Depending on the fire selected, the twin-walled pipe may exit horizontally through an external wall or vertically through the roof. No electric supply is required; therefore there is no sound with a balanced flue system.

Pre Fabricated Flue Pre-Fabricated or Pre-Fab Flue (Class 2) Identified by a steel flue terminal on the roof or by the metal flue box behind the fire. These flues create the same circulation of heated air as a brick or stone chimney. 
Pre-Cast Flue Pre-Cast Flue (Class 2) Can be identified by a raised ridge vent terminal. Built from concrete or clay blocks, pre-cast flues provide a rectangular sectional flue. This causes a natural circulation of heated air to expel the compustion products.

These flues tends to be very shallow in depth so a slimmer fire is often required. Deep appliances however may be able to be installed with the use of either a spacer kit or deeper rebate into the fireplace.

Powerflue Powerflue Requires an electricity supply, can be identified by the fan unit on the external wall (Approx 300mm square)

No Chimney Required. Powerflue fires expel the combustion 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 a failure.


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