Technical data

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.
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
3
/h of natural gas. The gas meter
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.
7. Gas Supply
6. Siting the Flue Terminal
L
L
K
K
F
F
G
A
M
EJF
HI
D
G
A
B,C
6
Fig. 5. Acceptable terminal positions.
TERMINAL POSITION MIN. DISTANCE
A– Directly below an openable window or
other opening e.g. air brick. 300 mm (12 in.)
B– Below gutters, soil pipes or drain pipes. 75 mm (3 in.)
C– Below eaves. 200 mm (8 in.)
E– From vertical drain pipes and soil pipes. 75 mm (3 in.)
F– From internal or external corners. 300 mm (12 in.)
G– Above ground, roof or balcony level. 300 mm (12 in.)
H– From a surface facing a terminal. 600 mm (24 in.)
I– From a terminal facing a terminal 1200 mm (47 in.)
K– Vertically from a terminal on the same
wall. 1500 mm (59 in.)
L– Horizontally from a terminal on the same
wall. 300 mm (12 in.)
M– From door, window or air vent (achieve
where possible). 150 mm (6 in.)
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.