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See Fig. 3.
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 850mm of a plastic or painted
gutter or within 450mm of painted eaves then an aluminium
shield at least 750mm 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 compartments
with less clearance than those above (minimum clearances given
in Section 4. Siting The Appliance) then permanent 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
6
L
L
K
K
F
F
G
A
M
EJF
HI
D
G
A
B,C
Fig. 3. Siting of the flue terminal.
TERMINAL POSITION MIN. DISTANCE TERMINAL POSITION MIN. DISTANCE
A– directly below an openable window or I– From a terminal facing a terminal 1200mm (47in.)
other opening e.g. air brick. 300mm (12in.) J– From an opening in a car port (e.g. door
B– Below gutters, soil pipes or drain pipes. 75mm (3in.) window) into dwelling. 1200mm (47in.)
C– Below eaves. 25mm (1in.) K– Vertically from a terminal on the same
D– Below balconies or car port roof. 25mm (1in.) wall. 150mm (6in.)
E– From vertical drain pipes and soil pipes. 25mm (1in.) L– Horizontally from a terminal on the same
F– From internal or external corners. 25mm (1in.) wall. 300mm (12in.)
G– Above ground, roof or balcony level. 300mm (12in.) M–From door, window or air vent (achieve
H– From a surface facing a terminal. 600mm (24in.) where possible). 150mm (6in.)
Above the Turret 20mm
In front 250mm
Below 200mm
Right-hand side 75mm
Left-hand side 75mm
POSITION OF AIR FROM AIR DIRECT
AIR VENTS THE ROOM FROM OUTSIDE
HIGH LEVEL 270cm
2
135cm
2
LOW LEVEL 270cm
2
135cm
2