External Balanced Flue - Grant Combi 70 V3 User's Installation Manual

Extensions are available which extend the flue by
225 mm, 450 mm or 950 mm. An adjustable
extension of 275 to 450 mm is also available.
A 45° elbow is also available. No more than 2 x
45° elbows should be fitted per system. Each elbow
reduces the overall maximum length of the system
by 1 metre.
4 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 Fig. 14.
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 Fig. 14.
All models upto 26 kW
Item
Starter kit - standard
Starter kit - short
150 mm extension
250 mm extension
450 mm extension
950 mm extension
195-270 mm adjustable extension
45° elbow
High level terminal
Vertical terminal
Wall bracket - standard
Wall bracket - extended
5 - GENERAL BOILER INFORMATION
Part No.
GK90
GK90S
GX150/90
GX250/90
GX450/90
GX950/90
GXA250/90
GE45/90
GTH90
GTV90
GWB90
GEB90
Combi V3, Combi Max and Vortex Combi models
The minimum dimensions for locating the terminal
from building features (windows, doors, etc.) are
shown in Fig. 15.
If the flue terminal is fitted less than 2 metres above a
surface to which people have access, the terminal must
be protected by a guard. The guard must be fitted
centrally over the flue terminal and securely fixed to
the wall.
The low level balanced flue (Yellow system) is
supplied with a stainless steel guard. This must be
fitted in all circumstances to prevent objects from
entering the flue outlet.
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
All models over 26 kW
Item
Starter kit - standard
Starter kit - short
150 mm extension
250 mm extension
450 mm extension
950 mm extension
195-270 mm adjustable extension
45° elbow
High level terminal
Vertical terminal
Wall bracket - standard
Wall bracket - extended
Part No.
GK200
GK200S
GX150/200
GX250/200
GX450/200
GX950/200
GXA250/200
GE45/200
GTH200
GTV200
GWB200
GEB200
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