6.8.5 Solid fuel – flue pipes
Flue pipes shall be correctly designed to connect an appliance to a flue safely. Issues to be taken into account include:
- size, direction and jointing
- separation from combustible materials.
Size, direction and jointing#
Flue pipes should have a cross-section which is equal to the outlet of the appliance they serve and should not be inclined more than 45° from vertical. A horizontal section no longer than 150mm may be used to connect a back outlet appliance to a flue.
Socket joints should be fitted socket up.
Separation from combustible materials#
Flue pipes should be separated from combustible materials in accordance with Building Regulations, and:
- by a minimum 200mm of non-combustible material
- by an air space which is a minimum of 4xD, or
- be shielded by a non-combustible shield at least 4xD in width, and extended at least 1.5xD either side of the flue pipe; the shield should be at least 12mm from the combustible material, and the flue pipe at least 1.5xD from the combustible material.
(D = external diameter of the flue pipe)
Last updated: 2nd January 2024