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Different Wood Burning Stove Flue Systems

Estimated reading time: 1 minute

Class 1 Flue

Older houses usually have a Class 1 solid-fuel flue (identifiable by the ‘chairbrick’ which has a minimum 7″ diameter and generally terminates with a brick or stone built chimney.

Class 2 Flue

Newer homes may also have a Class 2 flue with a 5″ minimum diameter that terminates with a cowl. The most common is a gas cowl as illustrated.

Pre-cast Flue

A more modern home may have a pre-cast flue (usually identifiable from the starter block or letter-box opening) that terminates with a ridge tile, as illustrated.

Fan Flue

A fan flue alternative is available for new homes built without a chimney or older properties where the flue is no longer of sound integrity. All that is required is a suitable outside wall.


  1. Can any woodburner be fitted to a precast flue? Thanks.

  2. This would be dependant on the flue outlet size of your wood burner.

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