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5. Siting The Flue Terminal
The flue system must be installed following the requirements of
BS5440:1.
The standard uncut flue kit length is 425 - 725mm. Extension
kits for flues up to 4m (24CDi), 3m (28CDi and 35CDi II) are
available.
The terminal must not cause an obstruction nor the combustion
products a nuisance.
A minimum of 75mm must be achieved where the terminal is
near fusible or combustable materials such as a plastic drain
pipe or guttering or carport roof UNLESS suitable heat shields are
provided.
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 guard Type K2 can be obtained from Tower Flue Components,
Vale Rise, Tonbridge, TN9 1TB.
It is essential that products of combustion cannot re-enter the
building. Refer to Fig 4.
Fig. 4. 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 .
POSITION OF
AIR VENTS
HIGH LEVEL
LOW LEVEL
Advice should be taken if the terminal is in close proximity to surfaces which may
MIN. DISTANCE
bo of plastic materials i.e. car-ports, gutters etc.
300 mm
75 mm
25 mm
25 mm
25 mm
25 mm
300 mm
600 mm
1200 mm
1200 mm
1500 mm
300 mm
300 mm
A
G
D
HI
F
J
7
6. Air Supply
6.1 The appliance does not require a separate vent for
combustion air.
6.2 The appliance can be fitted in a cupboard or compartment
with no vents for cooling but the minimum clearances must be
increased to those given below. (Note: The clearance at the front is
to removable panel, e.g. a door).
Above the flue turret
In front
Below
Right-hand side
Left-hand side
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.
AIR FROM
THE ROOM
24CDi
28CDi
35CDi II
2
2
270 cm
315 cm
393 cm
2
2
270 cm
315 cm
393 cm
6.5 Refer to BS 6798 and BS 5440:2 for additional information.
B,C
A
G
M
E
30mm
250mm
200mm
75mm
75mm
AIR DIRECT
FROM OUTSIDE
24CDi
28CDi
2
2
2
135 cm
158 cm
2
2
2
135 cm
158 cm
L
K
L
K
F
F
35CDi II
2
197 cm
2
197 cm
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