44
!
NOTE
The adjustable section is NOT
load bearing, therefore adequate
support of the flue system MUST
be provided immediately above the
adjustable extension.
To temporarily assemble the flue
system components, to check
component lengths, alignment of
connections, etc. DO NOT fit the lip
seals. However, for FINAL assembly
the lip seals provided MUST be fitted at
EVERY joint.
7.4.3 Adjustable Length
The Grant ‘Biomass’ flue system
includes an Adjustable flue extension.
Refer to Section 7.9. This allows any of
the straight flue extension components
to be extended in length by between
100mm to 280mm (this does not apply
to the 200mm extension) - refer to
Section 7.9. This adjustable extension
must be used in conjunction with any
straight extension (1000mm, 500mm,
333mm or 200mm) to achieve the
actual straight length required.
To fit the adjustable extension, first
remove insulation from between the
inner and outer walls of the component,
as necessary. Fit the open end over
the ‘male collar’ end of the fixed
extension and adjust to achieve the
required overall length. Secure the two
components together using the wide
locking band supplied.
pair of Wall Support Side Plates (Grant
Ref. WPW/WS or WPB/WS) or a pair of
Cantilever brackets (Grant Ref. WPB/
CANT), which are fastened to the wall,
to provide support at either the base, or
part way up, a vertical section of flue.
The ‘female collar’ (on the underside
of the plate) is fitted into the flue below
and the ‘male collar’ (on the upper side
of the plate) is a twist-lock connection
into the flue above. Both joints are
secured using the clamp bands
provided.
Wall Brackets (product code: WPB/
WB60)
Both the Wall bracket and the
Adjustable Wall Bracket (Grant Ref.
WPW/WB300 and WPB/WB300) are
NOT load-bearing but are designed to
give lateral support only. Wall brackets
should be fitted with a maximum
spacing of 3m on straight runs of flue
and at any offset to ensure the system
is rigidly supported.
Roof Support Band (product code:
WP/RS)
As with the Wall Brackets, the Roof
Support Band is not load bearing but is
designed to give lateral support only.
Guy Wire Bracket (product code:
WPB/GB)
Where the flue is free standing above
the roof and its height exceeds 1.5m
beyond the last support of the roof
(e.g. Roof Support Band) a Guy Wire
Bracket MUST be used and at every
1.5m thereafter. Grant does not supply
the guy wires or tie rods to use with this
bracket.
Structural Locking Band (product
code: WPB/LBEXT)
A height of up to 3m above the last
support at the roof can be achieved,
without the need for guy wires, by using
an extended Structural locking band
at the joint immediately below, and at
every joint above, the last flue support.
Figure 7-4: Fitting of locking band
All joints in the flue system must be
accessible for inspection. No joints
should be located within a wall,
floor or ceiling spaces or any other
inaccessible place.
!
WARNING
7.4.5 Support Components
The weight of the flue system is
considerable. It must NOT be carried by
the flue connection on the appliance,
but requires independent support using
one or more of the various flue support
options available in the Grant ‘Biomass’
flue system.
Ventilated Support Plate (product
code: WPB/SP)
On internal systems, the weight can
often be supported where the flue
passes through an upstairs floor, using
the Support Plate with clamp band. A
four-sided square opening, formed by
timber stringers between the joists, is
required to support the plate. Ensure
that the minimum distance of 60mm is
achieved between the flue outer surface
and the any combustibles (e.g. timber
joists). A Ventilated Fire Stop Plate
(Grant Ref. WPW/FP or WPB/FP) should
be fixed to the ceiling below.
Ventilated Fire Stop Plate (product
code: WPB/FP)
This is not a support but a Ventilated
Fire Stop Plate is required to be fixed to
the ceiling below a Ventilated Support
Plate. When passing through a second
upstairs floor (in a 3-storey house)
either a second support plate can be
fitted or alternatively two ventilated fire-
stop plates (one above and one below)
need be fitted if the flue is adequately
supported at the first upstairs floor level.
The slots in the Stop Plate allow air
to pass through but will not allow the
passage of flame. Also, the slots enable
the distance from combustibles to be
checked. If no combustible material
is visible though the slots, then the
minimum clearance distance of 60mm
has been met.
Intermediate Top Plate (product
code: WPB/TP)
Flue systems running up against either
an Internal or external wall surface can
be supported using the Intermediate
Top Plate. This is mounted on either a
Locking
band
To Next Page
Loading...
