! NOTE !
The Grant Orange system exible stainless steel liner
is directional. The arrows marked on the liner MUST be
pointing vertically upwards, following the direction of the
ue gases. Failure to comply with this instruction could
lead to a leakage of condensate from the ue liner.
If a rigid ue is used externally, it must be of the twin-wall type,
to reduce the possibility of the condensate freezing in the ue,
incorporating seals at all joints, constructed with a stainless steel
inner skin and be suitably insulated and weatherproofed. The
internal ue diameter for a rigid ue for all models - up to and
including the 46-70 - is 100 mm (4 in).
For a rigid conventional ue system Grant recommends the use
of the Grant ‘Hybrid’ ue system, which uses the Grant Green
and Orange ue system components for this application. Refer to
Section 1.3 for details.
! NOTE !
As no ue adaptor is supplied with the boiler, in order to
correctly connect the hybrid system, it will be necessary
to purchase the Grant CF adaptor kit (product code:
CFA15/70).
If required, it is possible to use the white painted single-wall
straight ue extensions, adjustable extensions and elbows from
the Grant ‘Orange’ system for the internal section of the ue
system, see Figure 9-3. These components can be tted between
the boiler connector and ue adaptor. The ue adaptor, to which
the external twin-wall ‘Green’ ue components are connected, can
therefore be situated just before the ue system passes through
the wall. See Figure 9-4.
! NOTE !
Grant ‘Orange’ system single-wall ue components must
not be used externally.
The maximum vertical height (from the top of the boiler to the
terminal) for the 100 mm diameter hybrid ‘Green/Orange’ system
is 19 metres.
Grant ‘Green’ twin-wall ue is recommended for externally run
ues to reduce the possibility of the condensate freezing in the
ue.
No part of any ue system should be made of an asbestos
material; aluminium must not be used in any part of the ue.
Only stainless steel ue components should be used.
If the draught conditions are satisfactory, the ue should terminate
with a standard cowl.
Refer to the locally applicable Building Regulations, BS 5410:1
and OFTEC Installation Requirements (OFTEC Technical Books 2
and 4) for further guidance on conventional ue systems.
! CAUTION !
It is important to ensure that the ue system is sealed and
that condensate cannot escape. Up to 1.5 l/h of condensate
can be produced in a conventional ue system.
Do not use re cement. The use of high temperature
silicone sealants is recommended.
! NOTE !
To comply with the requirements of the Building
Regulations Approved Document J - conventional ue
systems must have a ue data plate. A suitable data plate
is supplied with the Grant Orange ue system and should
be displayed next to the boiler or ue.
FLUE LINING KITS
Grant EZ-Fit Flexi Pack conventional ue system (Orange
System)
A range of Flexi pack conventional ue lining kits are available
from Grant UK. The packs have been specically produced for
Grant Vortex oil red condensing boilers.
The pack includes a terminal/top plate/exi ue adaptor, stainless
steel smooth bore exible ue liner, a rigid to exi adaptor and a
boiler ue connector.
Two diameters are available, a 100 mm for models up to 46 kW
and 125 mm for models above 46 kW.
Table 9-2: Conventional ue kits
Product code Flexi pack (Orange system)
GFKIT 6/100 100 mm diameter x 6 metre
GFKIT 6/125 125 mm diameter x 6 metre
GFKIT 8/100 100mm diameter x 8 metre
GFKIT 8/125 125mm diameter x 8 metre
GFKIT 10/100 100mm diameter x 10 metre
GFKIT 10/125 125mm diameter x 10 metre
GFKIT 11/100 100mm diameter x 11 metre
GFKIT 11/125 125mm diameter x 11 metre
GFKIT 12/100 100mm diameter x 12 metre
GFKIT 12/125 125mm diameter x 12 metre
GFKIT 14/100 100mm diameter x 14 metre
GFKIT 14/125 125mm diameter x 14 metre
GFKIT 16/100 100mm diameter x 16 metre
GFKIT 16/125 125mm diameter x 16 metre
Extensions
A range of white powder coated single wall extensions are
available to connect the boiler to the exible liner.
The nominal diameter of the extensions is 100 mm or 125 mm.
Extensions are supplied with locking bands.
Table 9-3: Extensions
Product code Extensions (Orange system)
WX 150/100 100 mm diameter x 150 mm
WX 150/125 125 mm diameter x 150 mm
WX 250/100 100 mm diameter x 250 mm
WX 250/125 125 mm diameter x 250 mm
WX 450/100 100 mm diameter x 450 mm
WX 450/125 125 mm diameter x 450 mm
WX 950/100 100 mm diameter x 950 mm
WX 950/125 125 mm diameter x 950 mm
WXA 250/100
100 mm diameter adjustable
extension (235 to 300 mm)
WXA 250/125
125 mm diameter adjustable
extension (235 to 300 mm)
WE 45/100 100 mm diameter 45° elbow
WE 45/125 125 mm diameter 45° elbow
! NOTE !
The rigid ue between the boiler and exible ue liner
should incorporate an adjustable section to allow
inspection and cleaning of the ue system.
Section 9: Flue System and Air Supply Page 27
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