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2.8
FLUES AND LOCATIONS - CONTINUED
B
B = Top Clearance
Top Clearance is measure from the top of the turret to the top
of the hole where the flue terminates.
L = Effective flue length.
The effective length of the flue is measured from the edge of
the turret to the flue terminal lip.
IMPORTANT INFORMATION
Install the flue in accordance to BS 5440:1 2008
Position the terminal, so the products of combustion do not
cause a nuisance.
The terminal outlet duct must not be closer than 25 mm to
combustible material.
The flue is secured in the wall using either sand and cement
or heatproof silicone.
The flue must be supported by a bracket every metre of flue
length and at every change of direction. Concealed flues
must have inspection hatches no more than 1.5 metres from
joints.
Where possible inspection hatches should be located at
change of directions. Where this is not possible then bends
must be viewable from both sides.
Inspection hatches must be at least 300 mm
Horizontal
15-24 Kw
30 kW
Vertical
15-24/30 kW
Elbows increase resistance and have an effective flue length
equivalence. The following table is an example.
Part
45
elbow
o
90
elbow
o
Effective flue length
18
Section 2 - Installation
1 m
2 m
3 m
4 m
.
2
Maximum Effective Flue Length
9.0 metres
8.0 metres
7.5 metres
x
Resistance
2
1.2 metres
2
2.0 metres
3.2 metres
L
Flue systems that require extension kits must be installed
with a 1.5° decline from the flue terminal back to the boiler.
A 1.5° decline can be achieved by designing the flue with a
26 mm rise per meter length of flue.
Table 5 - Flue Terminal Position
Flue Terminal Positions
1. Directly below, above or alongside an opening.
2. Below guttering, drain pipes or soil pipes.
3. Below eaves.
4. Below balconies or a car port roof.
5. From vertical drain pipes or soil pipes.
6. From an internal or external corner or a
boundary alongside the terminal.
7. Above adjacent ground, roof or balcony level.
8. From a surface or a boundary facing the terminal.
9. From a terminal facing a terminal.
10. From an opening in a car port into dwelling.
11. Vertically from a terminal on the same wall.
12. Horizontally from a terminal wall.
13. Horizontally from an adjacent window
14. Facing an opening into an adjacent building
15. At an angle to the boundary
16. Parallel to a boundary
17. Below ground level – open light well
*Only one reduction down to 25mm is allowed per installation.
Min. Spacing*
300 mm
75 mm
25 mm*
200 mm
25 mm*
200 mm
25 mm*
150 mm
25 mm*
300 mm
25 mm*
300 mm
600 mm
1200 mm
1200 mm
1500 mm
300 mm
600 mm
2000 mm
90°
300 mm
45°
600 mm
300 mm
a) Below ground
<1,000 mm
b) Above floor level
300 mm
c) From side
300 mm
d) From facing surface
600 mm
Installation and Servicing
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