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Flue System and
Air Supply
9 Flue System and Air Supply
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 12 metres for all Vortex boilers.
The following items are additionally
available:
• Extensions to extend the flue by
225mm, 450mm or 950mm.
• An adjustable extension of 275 to
450mm.
• A 45° elbow - No more than
6 x 45° elbows should be fitted
per system. Each elbow reduces the
overall maximum length of the
system by 1 metre.
The flue pipe seals are factory fitted and
must be lubricated with the lubricant
supplied before assembly.
The Red system is supplied as a separate
kit. Flue extensions and 45° elbows from
the White system may be used to extend
the flue between the boiler and the
flexible section of the system.
The maximum vertical straight length of
flue, from the top of the boiler to the top
of the terminal, is 20 metres - using no
more than four 45° elbows. Deduct 1
metre of straight flue length for every
elbow used.
Flexible Vertical Balanced Flue
(Red System) - for Combi 21e & 26e
only
This is a flexible vertical balanced flue
system designed to be fitted inside an
existing masonry chimney. See Figure 9-10.
It basically consists of three sections:
• Concentric white painted flue pipe
connected to the boiler.
• Vertical concentric flexible flue
(flexible stainless steel flue liner
inside a flexible plastic air inlet liner).
• Terminal assembly for chimney top
mounting.
Figure 9-8: High level balanced flue
‘White’ system
Figure 9-7: White system extensions
White System Components
Item - for models up Part No. Combi Part No. Combi
to 26 kW output 21e and 26e 36e
High level flue kit - 1.2 metre HL K01 50/90 HL K02 90/200
Vertical flue kit - 3 metre VT K05 50/90 V T K06 90/200
225mm extension EXT K31 225/90 EXT K32 225/200
450mm extension EXT K09 450/90 EXT K10 450/200
950mm extension EXT K11 950/90 EXT K12 950/200
275-450mm adjustable extension EXT K13 ADJ/90 EXT K14 ADJ/200
45°elbow ELB K21 45/90 ELB K22 45/200
Pitched roof flashing - aluminium
(for VT K05 50/90)
VT MF 90 VT MF200
Pitched roof flashing - lead
(for VT K05 50/90)
VT K25 P90 VT K26 P200
Flat roof flashing - aluminium
(for VT K05 50/90)
VT K27 F90 VT K28 F200
Wall bracket BRK 29 90 BRK 30 200
If the flexible liners have to pass
around an offset inside the chimney
deduct 2 metres of straight flue
length to compensate for this.
Flue extensions cannot be cut, use
adjustable extensions where required.
Three types of locking band are
supplied with the kit.
The first type is for connecting flue
sections that butt together (2 of this
type of locking band are supplied).
The second type is to cover the joint on
the adjustable (telescopic) section.
!
NOTE
The Grant “Red” system flexible
stainless steel flue liner is directional.
The arrows indicated on the liner
must be facing vertically up the
chimney, following the direction of
the flue gases. Failure to comply with
this instruction could lead to a
leakage of condense from the flue
system.
!
NOTE
The locking band for the adjustable
section is labelled for easy identification.
The third locking band is plastic and
supplied in two halves. This is to secure
the plastic flexible liner to the adaptor.
!
NOTE
950mm
extension
450mm
extension
225mm
extension
275 to
450mm
adjustable
extension
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