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. Refer to Fig. 7.
5.3
If a terminal is fitted less than 2 metres above a surface to
which people have access then a guard must be fitted. The guard
must be evenly spaced around the terminal and fixed with
plated screws. A type K2 guard is available from Tower Flue
Components, Vale Rise, Tonbridge, TN19 1TB.
5.4
The terminal guard must be evenly spaced about the flue
terminal and fixed to the wall using plated screws.
5.5
In certain weather conditions a terminal may steam and
siting where this could cause a nuisance should be avoided.
5.6
Take care to ensure that combustion products do not enter
ventilated roof voids.
5.7
The standard flue kit is horizontal and extends from 425 to
725mm in length. It can be shortened to 330mm (for single brick
wall applications) by cutting the flue ducts if required. Extension
kits are available for flue lengths up to 2500mm. A vertical flue
system for heights upto 2.3m plus the terminal assembly. Refer to
Table 2.
45° and 90° bends are available.
6.1
A separate vent for combustion air is not required.
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 Supply
5. Siting The Flue
7
L
L
K
K
F
F
G
A
M
E
J
F
HI
D
G
A
B,C
Fig. 7. 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
other opening e.g. air brick.
300mm
J– From an opening in a car port (e.g. door
B– Below gutters, soil pipes or drain pipes.
75mm
window) into dwelling.
1200mm
C– Below eaves.
25mm
K– Vertically from a terminal on the same
D– Below balconies or car port roof.
25mm
wall.
1500mm
E– From vertical drain pipes and soil pipes.
25mm
L– Horizontally from a terminal on the same
F– From internal or external corners.
25mm
wall.
300mm
G– Above ground, roof or balcony level.
300mm
M– From door, window or air vent
H– From a surface facing a terminal.
600mm
300mm
Above the Turret
30mm
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
300cm
2
150cm
2
LOW LEVEL
300cm
2
150cm
2
