20
Minimum distances to terminals in millimetres as measured from top of the chimney
or the rim of a low level discharge opening
A Directly below an opening, air brick, window etc 600
B Horizontally to an opening, air brick, window etc 600
C Below a gutter, eaves or balcony with protection 75
D Below a gutter or a balcony without protection 600
E From vertical sanitary pipework 300
F From an internal or external corner 300
G Above ground or balcony level 300
H From a surface or boundary facing the terminal 600
J From a terminal facing the terminal 1200
K Vertically from a terminal on the same wall 1500
L Horizontally from a terminal on the same wall 750
M Above the highest point of an intersection with the roof 600
N From a vertical structure on the side of the terminal 750
0 Above a vertical structure less than 750mm from the side of the terminal 600
P From a ridge terminal to a vertical structure on the roof 1500
These notes form an integral part of the information shown above.
1. Terminals should be positioned so as to avoid products of combustion accumulating in stagnant pockets
around the building or entering into buildings.
2. Appliances burning Class D oil have additional restrictions.
3 Vertical structure in N, 0 and P include tank or lift rooms, parapets, dormers etc.
4. Terminating positions A to L are only permitted for appliances that have been approved for low level flue
discharge when tested to OFS A1OO or A1O1.
5. Terminating positions must be at least 1.8 metres distant from an oil storage tank unless a wall with at least
30 mins fire resistance and extending 300mm higher and wider than the tank is provided between the tank
and the terminating position.
6. Where a flue is terminated less than 6OOmm away from a projection above it and the projection consists
of plastic or has a combustible or painted surface, then a heat shield of at least 750mm wide should be
fitted to protect these surfaces.
7. For terminals used with vapourising burners, a horizontal distance of at least 2300mm is required between
the terminal and the roof line.
8. If the lowest part of the terminal is less than 2 metres above the ground, balcony, flat roof or other place to
which any person has access, the terminal must be protected by a guard.
4
INSTALLATION
Clearances advised by the British Standards for Open, Low Level
Discharges and Balanced Flues fitted to Oil Fired Boilers
4-D
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