Minimum Distance (mm)
Terminal Position Open Low-Level
Flue Discharge
A Directly below an opening, air brick, window, etc. ............... Not allowed 600
B Horizontally to an opening, air brick, window, etc. .............. Not allowed 600
C Below a gutter or sanitary pipe................................................ Not allowed 75
D Below eaves or a balcony.......................................................... Not allowed 600
E From vertical sanitary pipework.............................................. Not allowed 75
F From an internal or external corner......................................... Not allowed 300
G Above ground or balcony level ................................................ Not allowed 300
H From a surface facing the terminal.......................................... Not allowed 600
J From a terminal facing the terminal........................................ Not allowed 1200
K Vertically from a terminal on the same wall .......................... Not allowed 1500
L Horizontally from a terminal on the same wall..................... Not allowed 300
M Above an intersection with the roof........................................ 600 Not applicable
N From a vertical structure on the side of the terminal ........... 600 Not applicable
O Above a vertical structure less than 750 mm from the
side of the terminal..................................................................... 600 Not applicable
NOTE: The dimensions given are for general guidance only. Other surrounding buildings or objects may affect the clearance of
combustion products. An alternative flue terminal position should be sought when there is any possibility of a nuisance being
caused by inadequate dispersal of flue products.
Terminals should be positioned so as to avoid products of combustion entering into buildings.
Fig. 7. Flue terminating positions for oil-fired appliances
Open
Flue
Window
Flue
Terminal
6. The terminal guard must be evenly spaced about the flue
terminal and secured using screws so that the terminal guard
can be removed for maintenance to the flue terminal..
7. In certain weather conditions a terminal may steam and
siting where this could cause a nuisance should be avoided.
8. Take care to ensure that combustion products do not enter
ventilated roof voids.
Fig. 8. Terminal guard Minimum dimensions.
265
280
280
Terminal guard.
See 7.4.5.