6.8.22 All – flues
Flues shall be suitable for their purpose and adequately separated from combustible materials.
Flues should be:
- suitable for the type and size of appliance which they serve
- constructed in accordance with the design and the manufacturer’s recommendations
- tested in accordance with this chapter.
Combustible materials close to any brickwork or blockwork chimney should be:
- 200mm minimum from a flue
- 40mm from the face of the chimney, in Scotland, and
- metal fixings in contact with combustible materials should be a minimum of 50mm from the flue.
This does not apply to a floorboard, skirting, dado or picture rail, mantel shelf or architrave.
Twin wall flue systems should comply with:
- BS EN 1856, or
- be assessed in accordance with Technical Requirement R3.
Last updated: 2nd January 2024