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6.3 Flue components & assembly

6.3.1 Combined fan box & flue starter

. The boiler is

supplied with a combined fan box & flue starter connector
that comes packed inside the boiler combustion chamber.
The unit comes complete with exhaust flue fan, draught
stabilizer

and a connection to take the Grant „Black‟ flue

system. The draught stabilizer must not be boxed or
obstructed from operation in any way. Also fitted is a clean
out hatch to allow removal of any ash that may have
dropped down the flue system. The clean-out hatch should
be fully closed during normal operation. See section 10
servicing.

The flue connector is fitted with a neoprene gasket for
connection to the boiler. The neoprene gasket is to
accommodate a low temperature wet flue system that is
achieved on the condensing boiler. The attached wiring
harness is for flue fan along with the connection for the
wash system.
When fitting the flue system to the boiler the gasket seals
supplied

must

be fitted to the flue inner liner at every joint.

A condensate drain at the base of the flue is not required
as the flue connector is designed to allow the condensate
run back into the boiler.

6.3.2 Flue System.

The „Black‟ flue system is a twin wall

fully insulated flue which reduces the possibility of freezing
in the flue on condensing boilers. The flue also has a high
corrosion resistance suitable for solid fuel.

No horizontal section should be used or no elbow

greater than 45° should be used as these can cause a

build up of ash and condensate in the flue. Also all flue

joints must have a seal fitted on each joint of the inner

liner.

Failure to maintain a clean flue can result in the

emission of flue gases into the dwelling or damage

from fire in the flue. See section 10.3 Cleaning the

Boiler & Flue

6.3.3 Joining components.

The joint is locked by rotating

the upper section clockwise. To secure the joint, the locking
band supplied with the female end of all components must
be used. To allow alignment, there are no locating flutes on
the female section of the elbow. For this reason these joints
MUST be secured using the locking band. All flue joints
must have a lip seal gasket fitted on the bead of the

projecting liner spigot of every joint. The lip seal should be
fitted dry and lubrication applied to the internal of the socket
into which it is to be assembled.

6.3.4 Adjustable length.

An adjustable flue length allows

adjustment from 75mm up to 250mm. Assembly is achieved
by fitting the adjustable length over the proceeding pipe.
Remove insulation as necessary and secure when desired
length is achieved using joint band supplied. The adjustable
section is not load-bearing, therefore adequate support
must be provided immediately above.

6.3.5 Support components.

The weight of a chimney

system is considerable and requires independent support.
No weight should be taken by the appliance. On internal
systems the weight is held by using a support plate and
clamp fixed on top of the first floor/ceiling joist. A fire-stop
plate is also required fixed to the ceiling below. In a normal
house, when passing through the second floor the only
requirements is two fire-stop plates because the system is
adequately supported at first floor level.
Wall brackets and roof brackets are not load bearing and
give lateral support only. Wall brackets should be fitted
every 3m and at any offset to ensure the system is rigidly
supported.
Where the flue is free standing above the roof and its height
exceeds 1.5m beyond the last support or the roof a guy wire
bracket must be used and every 1.5m thereafter.
Alternatively a height of up to 4m can be achieved
unsupported with the use of an extended locking band at
the joint immediately below every joint above the roof.