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3. The terminal must not cause an obstruction nor the discharge
cause a nuisance as a result of either flue gases or terminal noise.
4. If the terminal is fitted within 1m of a plastic or painted gutter or
within 500 mm of painted eaves then an aluminium or stainless
steel shield at least 1m long should be fitted to protect the surface.
5. If a terminal is fitted less than 2 metres above a surface to
which people have access, fit a terminal guard as shown in Fig. 8.
A suitable guard is available from Worcester Heat Systems, Part
Number 7 716 190 009, or alternatively a proprietary terminal
guard may be used provided it has the minimum dimensions
shown in Fig. 8.
The guard should have suitable corrosion resistance due to the
acidic content of the flue gases.
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. 7. Flue terminating positions for oil-fired appliances
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.
Boundry
Boundry
Terminal Position
A
Directly below an opening, air brick, window, etc. .......................................... Not allowed
B
Horizontally to an opening, air brick, window, etc. ........................................ Not allowed
C
Below a gutter or sanitary pipe if combustible material protected. .............. Not allowed
D
Below a balcony, eaves, gutter or drainage without protection
to combustible material. ...................................................................................... Not allowed
E
From vertical sanitary pipework.. ....................................................................... Not allowed
F
From an internal or external corner or boundry along side terminal. .......... Not allowed
G
Above ground or balcony level. .......................................................................... Not allowed
H
From a surface or boundry facing the terminal. .............................................. Not allowed
J
From a terminal facing the terminal. ................................................................. Not allowed
K
Vertically from a terminal on the same wall. ................................................... Not allowed
L
Horizontally from a terminal on the same wall. .............................................. Not allowed
M Above an intersection with the roof. .................................................................
N
From a vertical structure on the side of the terminal......................................
O
Above a vertical structure less than 750mm from the side of the terminal.
P
From a ridge terminal to a vertical structure on the roof................................
F
J
H
E
Fig. 8. Terminal guard Minimum dimensions.
280
Terminal guard.
See 7.4.5.
P
M
M
C.D.
B
A
Window
Flue
Terminal
G
Open
Flue
600
750
600
1500
11
265
280
O
N
K
F
L
F
Minimum Distance (mm)
Low-Level
Discharge
Balanced Flue
600
Not allowed
600
75
600
300
300
300
600
1200
1500
750
Not applicable
Not applicable
Not applicable
Not applicable
Not applicable
Vertical
''
''
''
''
''
''
''
''
''
732
750
732
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