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6. Siting the Flue Terminal
The flue must be installed in accordance with BS 5440:1 and the
Building Regulations.
The terminal must be positioned so that it does not cause an
obstruction or the combustion products a nuisance. See Fig.5.
The terminal will, at times, give out a plume of water vapour and
consideration must be given to this when choosing a terminal
position. Keep clear of security lighting, activated by passive
infra-red sensing heads.
If the terminal is within 1m of a plastic or painted gutter or
within 500mm of painted eaves then an aluminium shield at
least 750mm long should be fitted to the underside of the gutter
or painted surface.
Fig. 5. Acceptable terminal positions.
TERMINAL POSITION
A– Directly below an openable window or
other opening e.g. air brick.
B– Below gutters, soil pipes or drain pipes.
C– Below eaves.
D– Below balconies or car port roof.
E– From vertical drain pipes and soil pipes.
F– From internal or external corners.
G– Above ground, roof or balcony level.
H– From a surface facing a terminal.
I– From a terminal facing a terminal
J– From an opening in a car port (e.g. door
window) into dwelling.
K– Vertically from a terminal on the same
wall.
L– Horizontally from a terminal on the same
wall.
M– From door, window or air vent (achieve
where possible).
A
G
D
HI
MIN. DISTANCE
300 mm (12 in.)
75 mm (3 in.)
200 mm (8 in.)
200 mm (8 in.)
75 mm (3 in.)
300 mm (12 in.)
300 mm (12 in.)
600 mm (24 in.)
1200 mm (47 in.)
1200 mm (47 in.)
1500 mm (59 in.)
300 mm (12 in.)
150 mm (6 in.)
B,C
F
J
E
If the terminal is less than 2m above a surface to which people
have access then a guard must be fitted. The guard must be
evenly spaced about the terminal with a space of 50mm in each
direction and fixed with plated screws.
A guard, can be obtained from Tower Flue Components, Vale
Rise, Tonbridge TN9 1TB.
The appliance requires 2.54m
and supply pipes must be capable of supplying this quantity of
gas in addition to the demand from any other appliances being
served.
The meter governor should deliver a dynamic pressure of 20
mbar at the appliance, equivalent to a pressure of about 18.5 –
19mbar at the gas valve inlet.
Where LPG is used, following conversion from Natural Gas, then
a dynamic inlet pressure of 37mbar at the inlet to the appliance
is required. Equivalent to a pressure of about 34.5 – 35mbar at
the gas valve inlet.
The complete installation, including the meter, must be tested
for soundness and purged. See BS 6891.
F
A
G
M
6
7. Gas Supply
3
/h of natural gas. The gas meter
L
L
F
K
K
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