Flue terminal positioning
Note
All measurements are the minimum clearances required
Terminals must be positioned to avoid combustion products entering the building
Support the flue at approximately one metre intervals and at a change of direction, use suitable brackets and fittings (flue bracket part numbers: 100mm - 7 716 191 174)
Key to illustration
Flue clearance must be at least 300mm from the ground. Terminal guards must be fitted if the flue is less than 2 metres from the ground or if a person could come into contact with the flue terminal
600mm distance to a boundary, unless it will cause a nuisance. BS 5440: Part 1 recommends that care is taken when siting terminals in relation to boundaries
600mm minimum clearance from a skylight to a vertical flue
Vertical flue clearance, 500mm to non-combustible building material, and 1,500mm clearance to combustible building materials
The dimension below eaves, gutters, pipes and drains can be reduced to 25mm, as long as the flue terminal is extended to clear any overhang. Any external flue joints must be sealed with suitable silicon sealant
500mm clearance to any vertical structure on a roof, 600mm to room sealed flue or 1,500mm to a open flue
1,500mm between a vertical flue terminal and a window or dormer window
400mm from a pitched roof or in regions with heavy snow fall 500mm
The flue cannot be lower than 1,000mm from the top of a light well due to the build up of combustion products
2,000mm below a Velux window, 600mm above or to either side of the Velux window
200mm below eaves and 75mm below gutters, pipes and drains
1,200mm between terminals facing each other
300mm to an internal or external corner
Installations in car ports are not recommended.
The dimension below eaves, balconies and car ports can be reduced to 25mm, as long as the flue terminal is extended to clear any overhang. Any external flue joints must be sealed with suitable silicon sealant.
300mm above, below and either side of an opening door, air vent or opening window
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