Which Type of Chimney or Flue do I have?
The Classic brick built chimney is suitable for all open flued gas fires. As these chimneys are deep you can choose a full depth fire through to the shallow slimline products. A brick chimney is recognised by a chimney stack, with either a pot or gas terminal on your roof. Also you will have a chimney breast either inside the room or on the outside wall for the fire to fit into. The diameter of the flue is a minimum of 7″ (175mm) or greater. The brick built chimney or a 7″ flue liner is also known as Class 1.
Pre-cast flues are found in many modern homes and can be suitable for slimline gas fires subject to inspection and testing. Pre-cast flues are recognised by a ridge vent or metal flue terminal on the roof. The Flue is constructed from concrete or clay blocks, they form a rectangular section flue and are very shallow in depth.