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5. Flue terminal positions
The flue system must be installed following the requirements of
BS5440: 1.
Standard flue kit length is 330 - 725mm (as measured from the
centre of the flue turret) with extension kits for flues up to
2975mm measured from the centre line of the flue turret.
The terminal must not cause an obstruction or the combustion
products a nuisance.
Under some conditions the terminal might steam and positions
where this might be a nuisance should be avoided. Refer to Fig 7
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 and fixed with plated screws.
A Type K2 guard is available from Tower Flue Components, Vale
Rise, Tonbridge, TN9 1TB.
Fig. 7. Siting of the flue terminal.
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
75 mm
200 mm
200 mm
75 mm
300 mm
300 mm
600 mm
1200 mm
1200 mm
1500 mm
300 mm
300 mm
B,C
F
J
E
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).
Above the Turret
In front
Below
Right-hand side
Left-hand side
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:
POSITION OF
AIR VENTS
HIGH LEVEL
LOW LEVEL
F
A
G
M
7
6. Air Supply
NG
30mm
75mm
200mm
10mm
10mm
AIR FROM
AIR DIRECT
THE ROOM
FROM OUTSIDE
2
315cm
2
315cm
L
L
F
LPG
30mm
250mm
200mm
75mm
75mm
2
158cm
2
158cm
K
K
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