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S
Fig. 6
The following guidelines indicate the general requirements
for siting balanced flue terminals.
For GB recommendations are given in BS 5440 Pt. 1.
For IE recommendations are given in the current edition of
I.S. 813 "Domestic Gas Installations"..
If a terminal is less than 2m above a balcony, above
ground, or above a flat roof to which people have access,
then a suitable terminal guard must be fitted. A terminal
guard is available (Part No. 205792), this should be fitted
centrally about the terminal.
If the terminal discharges onto a pathway or passageway,
check that the combustion products will not cause a
nuisance and that the terminal will not obstruct the
passageway.
If the flue terminal is fitted within 1 metre of a plastic gutter,
within 500 mm of a painted eave or a painted gutter, an
aluminium shield of at least 1 metre long, should be fitted
to the underside of the gutter or painted surface. An air
space of 5 mm should be left between shield and gutter..
IMPORTANT: It is absolutely ESSENTIAL, to ensure that
products of combustion discharging from the terminal
cannot re-enter the building, or any other adjacent building,
through ventilators, windows, doors, natural air infiltration,
or forced ventilation/air conditioning. If products of
combustion are found to be re-entering any building, the
appliance MUST be turned OFF IMMEDIATELY.
300 min.
Terminal
Assembly
Top View Rear Flue
Fanned Draught
10 Installation Requirements
J,K
N
R
M
I
I
F
L
Likely flue positions requiring
a flue terminal guard
300 min.
Top View Side Flue
Fanned Draught
Property Boundary Line
D
T
C
E
A
I
I
B
J,K
F
A
A
G
H
H
I
Terminal Position with Minimum Distance (mm)
For IE, refer to I.S. 813 "Domestic Gas Installation".
Fanned Draught Balanced Flue
a
A
Directly below an opening, air brick,
opening windows, etc.
a
B
Above an opening, air brick, opening window, etc.
a
C
Horizontally to an opening, air brick,
opening window, etc.
D Below gutters, soil pipes or drain pipes.
E
Below eaves.
F
Below balconies or car port roof.
G From a vertical drain pipe or soil pipe.
H From an internal or external corner.
I
Above ground, roof or balcony level.
J
From a surface facing a terminal.
K From a terminal facing the terminal.
L
From an opening in a carport (e.g. door, window)
into the dwelling.
M Vertically from a terminal on the same wall.
N Horizontally from a terminal on the same wall.
R From adjacent wall to flue (vertical only).
S
From internal corner to flue (vertical only).
T
Below eaves or balcony (vertical only).
a
In addition, the terminal should not be nearer than 150 mm to an opening
in the building fabric formed for the purpose of accommodating a built-in
element such as a window frame. See BS 5440 Pt. 1.
Reduced Clearances
This range of boilers has been tested and approved for use with certain
clearances less than those shown above.
Only one of these reductions may be used on a single installation.
D
Below a gutter, or sanitary pipework
E
Below the eaves
F
Below a balcony or carport roof
H
From vertical drain/soil pipe work
J
From an internal or external corner
Note: The distance from a fanned draught appliance terminal installed
parallel to a boundary may not be less than 300 mm in accordance with
the diagram on the left.
300
300
300
75
200
200
150
300
300
600
1200
1200
1500
300
210
230
600
RSL40-70
RSL80-100
25
25
25
25
25
25
25
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25
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Publication No. 5102977
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