See Fig. 4
5.1 The flue must be installed as specified in BS 5440:Part 1.
5.2 The terminal must not cause an obstruction nor the
discharge cause a nuisance.
5.3 If the terminal is fitted within 1000mm of a plastic or painted
gutter or within 500mm of painted eaves then an aluminium
shield at least 1000mm long should be fitted to the underside of
the gutter or painted surface.
5.4 If a terminal is fitted less than 2 metres above a surface to
which people have access then a guard must be fitted. See
Section 2.9.
5.5 The terminal guard must be evenly spaced about the flue
terminal and fixed to the wall using plated screws.
5.6 In certain weather conditions a terminal may steam and
siting where this could cause a nuisance should be avoided.
5.7 Take care to ensure that combustion products do not enter
ventilated roof voids.
6.1 The appliance does not require a separate vent for
combustion air.
6.2 The appliance can be fitted in a cupboard with no vents for
cooling but the minimum clearances must be increased to those
given below. (
Note: The clearances at the front are for a removable
panel, e.g. a door).
6.3 If the appliance is to be fitted in a cupboard or compartment with
less clearance than those in the table above (minimum clearances are
given in Section 4. Siting The Appliance) then permanent air vents for
cooling are required. One at high level and one at low level, either
direct to outside air or to a room. Both vents must pass to the same
room or be on the same wall to the outside air.
6.4 The minimum free areas required are given below.
6.5 Refer to BS 6798 and BS 5440:2 for additional information.
6. Air Supply5. Siting The Flue Terminal
6
POSITION OF AIR FROM AIR DIRECT
AIR VENTS THE ROOM FROM OUTSIDE
HIGH LEVEL 315 cm
2
158 cm
2
LOW LEVEL 315 cm
2
158 cm
2
Above the flue turret 30mm
In front 250mm
Below 200mm
Right-hand side 75mm
Left-hand side 75mm
Fig. 4. Siting of the flue terminal.
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. 25 mm (1 in.)
D– Below balconies or car port roof. 25 mm (1 in.)
E– From vertical drain pipes and soil pipes. 25 mm (1 in.)
F– From internal or external corners. 25 mm (1 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.)
J– From an opening in a car port (e.g. door
window) into dwelling. 1200 mm (47 in.)
K– Vertically from a terminal on the same
wall. 150 mm (6 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.)
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