! NOTE !
The Grant Orange system fl exible stainless steel liner
is directional. The arrows marked on the liner MUST be
pointing vertically upwards, following the direction of the
fl ue gases. Failure to comply with this instruction could
lead to a leakage of condensate from the fl ue liner.
If a rigid fl ue is used externally, it must be of the twin-wall type,
to reduce the possibility of the condensate freezing in the fl ue,
incorporating seals at all joints, constructed with a stainless steel
inner skin and be suitably insulated and weatherproofed. The
internal fl ue diameter for a rigid fl ue for all models - up to and
including the 46/70 - is 100 mm (4 in).
For a rigid conventional fl ue system Grant recommends the use
of the Grant ‘Hybrid’ fl ue system, which uses the Grant Green
and Orange fl ue system components for this application. Refer to
Section 1.3 for details.
! NOTE !
As no fl 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 fl ue extensions, adjustable extensions and elbows from
the Grant ‘Orange’ system for the internal section of the fl ue
system, see Figure 9-3. These components can be fi tted between
the boiler connector and fl ue adaptor. The fl ue adaptor, to which
the external twin-wall ‘Green’ fl ue components are connected, can
therefore be situated just before the fl ue system passes through
the wall. See Figure 9-4.
! NOTE !
Grant ‘Orange’ system single-wall fl 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 fl ue is recommended for externally run
fl ues to reduce the possibility of the condensate freezing in the
fl ue.
No part of any fl ue system should be made of an asbestos
material; aluminium must not be used in any part of the fl ue.
Only stainless steel fl ue components should be used.
If the draught conditions are satisfactory, the fl 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 fl ue systems.
! CAUTION !
It is important to ensure that the fl ue system is sealed and
that condensate cannot escape. Up to 1.5 l/h of condensate
can be produced in a conventional fl ue system.
Do not use fi re cement. The use of high temperature
silicone sealants is recommended.
! NOTE !
To comply with the requirements of the Building
Regulations - conventional fl ue systems must have a fl ue
data plate. A suitable data plate is supplied with the Grant
Orange fl ue system and should be displayed next to the
boiler or fl ue.
FLUE LINING KITS
Grant EZ-Fit Flexi Pack conventional fl ue system (Orange
System)
A range of Flexi pack conventional fl ue lining kits are available
from Grant. The packs have been specifi cally produced for Grant
oil fi red condensing boilers.
The pack includes a terminal/top plate/fl exi fl ue adaptor, stainless
steel smooth bore fl exible fl ue liner, a rigid to fl exi adaptor and a
boiler fl 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 fl 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 fl 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 fl ue between the boiler and fl exible fl ue liner
should incorporate an adjustable section to allow
inspection and cleaning of the fl ue system.
Section 9: Flue System and Air Supply Page 27
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