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10.6
TYPE OF FLUE SYSTEMS
10.6.1 The standard concentric flue system 60/100mm (100mm diameter).
10.6.2 A Flexible flue kit (FFK-5) 60/100mm (100mm diameter).
For further information contact the sales office at Johnson & Starley Ltd. Telephone 01604 762881.
10.6.3 The air/flue duct operates at very low temperatures therefore no clearance is necessary between the air
duct and the adjacent services.
10.7
FLUE TERMINAL POSITIONS
10.7.1 The following information provides the general requirements for siting flue terminals. As part of the
recommendation given in BS 1550 Part 1. For IE recommendations, see the current issue of I.S. 813
“Domestic Gas Installations.” Also publication a “Guide for Gas Installations in Timber Framed Housing
DM2” or consult your local gas region, MUST be consulted when installing the appliance into a timber-
framed building.
NOTE:
Due to the nature of the boiler, water vapour will discharge from the flue. This should be taken into
account when siting the flue
10.7.2 Both the horizontal and vertical terminals must be positioned on the outside of the building and the free
passage of air must be available at all times. It is not recommended to position the terminal close to
projections especially under a balcony or near to a drainpipe.
10.7.3 Ensure that combustion products cannot enter the building where the heater is installed or near to any
other building where doors or windows may be open.
10.7.4 Recommended terminal positions for both horizontal and vertical flues are shown. See Table 4. For flue
components see Table 5.
10.7.5 Where the lowest part of the flue terminal is located less than 2 metres above the ground, a balcony or
above a flat roof across which there is access, the terminal MUST be fitted with a guard (Part No: 1000-
0019710) which is available from Johnson & Starley. The distance between the guard and the nearest
part of the terminal must not be less than 50 mm.
10.7.6 The flue MUST NOT be installed under a car port.
10.8
PLUME TERMINAL OUTLETS
10.8.1 A flue duct outlet of an appliance should be at least 600mm from the boundary line when facing it and at
least 300mm from the boundary line when running parallel to it. See Figure 11.
NOTE:
When the flow of products is at an angle to the boundary, the 600mm dimension may be measured in the
direction of the flow, as long as the terminal is not less than 300mm from the boundary.
10.8.2 It is recommended the terminals are not sited within 2m of an opening in an adjacent building or within
2m of the boundary facing the terminal if the plume is likely to cause a nuisance to a neighbour, e.g
discharging over a walkway or patio.
10.9
FLUE REQUIREMENTS & GENERAL INFORMATION
10.9.1 Horizontal and vertical concentric flues (60/100mm diameter) with balanced terminals may be installed
on all the QuanTec appliances.
10.9.2 If an extended horizontal flue is being used it must have a continuous fall back towards the appliance of
3° (52mm) per meter. This ensures that condensate runs back into the appliance from the flue system for
safe discharge via the condensate waste pipe. Reference should be made to Table 5 for relevant part
numbers.
10.9.3 The maximum length of flue permissible is 12
meters including terminal
10.9.4 The minimum vertical flue length is 1.25m from
the top of the appliance case to the top of the
terminal.
10.9.5 Longer flues may be fitted, however the input
of the appliance will be reduced accordingly.
10.9.6 Elbows may be fitted within the flue system
with a corresponding reduction in overall flue.
10.9.7 Guidelines for the maximum flue length are as
follows.
FIGURE 11. PLUME TERMINAL OUTLET DIMENSIONS
HORIZONTAL FLUE
VERTICAL FLUE
TURRET
90° ELBOW
STRAIGHT
1m FLUE
90° ELBOW
STRAIGHT
1m FLUE
1
-
10
-
10
1
1
8
1
8
1
2
6
2
6
1
3
4
3
4
When using 45° elbows: 2 x 45° elbow = 1 x 90° elbow
