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Grant Vortex Oil Boilers
4 - GENERAL BOILER INFORMATION
Apart from a conventional flue, several balanced flue
options are available for use with the Grant Vortex
boilers. All are suitable for use with Class C2 kerosene.
Note: None of the flue sections in the following
system can be cut.
1
Low level horizontal balanced flue (Yellow system)
Available in Short (for single thickness brick walls)
and Standard kits.
Extensions are available which extend the flue by
225 mm, 450 mm or 675 mm. 90° and 45° elbows
are also available.
The maximum flue length - from the centre of the
boiler flue outlet to the outer face of the wall - is 4
metres (with or without elbows included). No more
than 2 x 45° or 1 x 90° elbow should be fitted per
system.
IMPORTANT: For Vortex boilers with the flue to
the left hand side - leave a minimum gap of 150
mm between the side of the boiler and the wall to
accommodate the condensate trap.
2
High level (horizontal) balanced flue (White
system)
Allows the flue to rise vertically within the building
before exiting through the wall horizontally.
The maximum flue length - from the top of the
boiler flue outlet to the outer face of the wall - is 6
metres for all Vortex boilers.
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.
3
Vertical balanced flue (White system)
Allows the flue to rise vertically from the boiler to
exit through the roof.
The maximum flue length - from the top of the
boiler flue outlet to the terminal - is 8 metres for all
Vortex boilers.
Balanced flue options
4.8
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. 10a.
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. 10a.
The minimum dimensions for locating the terminal
from building features (windows, doors, etc.) are
shown in Fig. 11.
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.
