Flue System and
Air Supply
35
Figure 9-10: Red system balanced flue
Green System Components
Item – for models up to 26 kW output Part No.
Starter kit – standard GK90
Starter kit – short GK90S
150mm extension GX150/90
250mm extension GX250/90
450mm extension GX450/90
950mm extension GX950/90
195-270mm adjustable extension GXA250/90
45º elbow GE45/90
High level terminal GTH90
Vertical terminal GTV90
Wall bracket – standard GWB90
Wall bracket – extended GEB90
External Balanced Flue
(Green system)
Where it is not practical to use a low
level (Yellow system) or internal high
level/vertical (White system) balanced
flue, the boiler can be fitted with an
external vertical/high level flue (Green
system).
See Figure 9-11.
The Starter kit fits to the boiler in the
same way as a low level balanced flue
(Yellow system) and the external Tee
allows the connection of a twin wall
insulated flue pipe and a combustion air
inlet - providing a room sealed flue
system.
The external system can terminate at
either high level or vertically (above roof
level) as required.
See Figure 9-11.
The minimum dimensions for locating
the terminal from building features
(windows, doors, etc.) are shown in
Figure 9-12.
The terminal must be positioned so as
to avoid products of combustion
accumulating in stagnant pockets
around the buildings or entering into
buildings. Care should be taken that the
plume from condensed flue gases does
not cause a nuisance.
The following external flue (Green
system) components are available from
Grant UK:
The flue kit includes a Black coated
terminal with upstand and is designed
to be fixed (using the screws provided)
to the top of a masonry chimney.
The flue system may be offset using 45°
elbows (ref. ELB K2145/90).
No more than a maximum of four
elbows should be used per system.
Figure 9-11: External balanced flue
(Green system)
Vertical terminal kit
45° elbow kit
High level terminal kit
Extended wall bracket
Extension kits
Starter kit
Wall bracket
Locking band
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