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The flue system must be installed following the requirements of
BS5440:1.
The standard flue kit length is 425 - 725mm. Extension kits for
flues up to 3.0m are available.
A rear flue suitable for walls from 220 - 375mm thick is available
which can be contained within the boiler casing.
The terminal must not cause an obstruction nor the combustion
products a nuisance.
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.
A separate vent for combustion air is not required.
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. Refer to BS6798.
Note: the clearance at the front is to a removable panel, e.g. door.
The user must
be informed not to restrict the clearances by the
addition of extra shelves etc and that flammable materials must
not be stored in this compartment.
If the appliance is fitted in a cupboard or compartment with less
clearance than those stated 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. Both high and low level vents must
communicate with the same room or must be on the same wall
to outside air. The minimum requirements are:
6. Air Supply5. Flue terminal positions
7
L
L
K
K
F
F
G
A
M
EJF
HI
D
G
A
B,C
Fig. 4. 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
Model Position of vent Air from room Air from outside
19/24CBi High 255cm
2
128cm
2
Low 255cm
2
128cm
2
14/19CBi High 207cm
2
104cm
2
Low 207cm
2
104cm
2
9/14CBi High 152cm
2
76cm
2
Low 152cm
2
76cm
2
Above Appliance (when using Rear only Flue) 30mm
Above Appliance (when using horizontal flue) 180mm
In front 340mm
Below 200mm
Right-hand side 105mm
Left-hand side 105mm
If the boiler is fitted between kitchen units and a decorative
door panel is fitted then the top and bottom of the space must
be left open.
*NOTE: A minimum of 75mm must be achieved
where the terminal is near fusible or combustible
material such as plastic drain pipes, guttering or a
carport roof UNLESS suitable heat shields are
provided.