Flue Types

What type of flue do I have?

Class I

Normally a property older than 1960 will have this type of flue. It will be a brick built chimney, suitable for a solid fuel fire and can be identified by the clay fire back or “chair brick” at the base of the opening. It will have a minimum diameter of 7” (175mm) and will terminate to a clay pot or cowl. The vast majority of fires are suitable for this type of flue.

Class II

There are two main types of this flue:

  1. An older property where the chimney is unsound will be lined with a 5” (125mm) flexible steel flue lining, which will be sealed at the top and bottom. This will terminate to a gas cowl. This type of flue is not suitable for a solid fuel fire or open basket
  2. A modern property without a chimney may well have a 5” (125mm) rigid sectional steel flue system. This will terminate through a short length of steel pipe to a gas cowl. This type of flue is not suitable for a solid fuel fire or open basket

Pre-Cast Flue

Most modern properties will have this type of flue. It is a sectional concrete flue block system and can be identified by the starter block or letter box at the base of the opening. This terminates to a purpose made raised ridge tile. This type of flue is not suitable for a solid fuel fire or open basket.

No Chimney or Flue

If you have no chimney or flue, then you have the following options:

  1. A Power flue, Fanned flue or Turbo flue gas fire
  2. An Electric fire
  3. A Balanced flue gas fire
  4. A Flue-less gas fire (new catalytic converter technology)

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