If L is greater than 725mm then extension duct kit/s will be
required - each kit extends the flue by 750mm up to a maximum
of 2975mm. See table below.
EXTENSION MAXIMUM FLUE LENGTH mm
1 1475
2 2225
3 2975
11.9 Measure and Cut the Ducts.
General: Cut the ducts as necessary, ensuring that the ducts are
square and free from burrs. Always check the dimensions before
cutting.
Measure the distance L. Refer to Fig. 22 and 23.
The standard flue can be telescopically adjusted to any length
between 425mm and 725mm measured from the centre of the turret.
Fix the flue assembly together using the self-tapping screw
provided. Refer to Fig. 20.
It will only be necessary to cut the standard assembly if L is less
than 425mm. Cut the flue turret assembly and
the terminal
assembly by the same amount i.e L=350 - remove 75mm from
each
assembly.
Minimum side flue length = 330mm (accommodating a
10mm Service clearance and a 100mm wall)
Minimum rear flue length = 300mm (accommodating a
100mm wall)
If L is between 1175 - 1475mm (1 extension)
1925 - 2225mm (2 extension)
2675 - 2975mm (3 extension)
it is not necessary to cut the ducts.
If L is between 725 - 1175mm (1 extension)
1475 - 1925mm (2 extension)
2225 - 2675mm (3 extension)
It is necessary to shorten the assembly by cutting the first
extension duct assembly i.e. L = 1000mm - remove 175mm
from the air and flue ducts.
14
Fig.20. Standard flue assembly
L
Fixing screw
Flue
turret
assembly
Appliance casing
Telescopic adjustment
Terminal
assembly
Fig.21. Extension duct
L
Fixing screw
Flue
turret
assembly
Appliance casing
Terminal
assembly
Fixing screw
Ducts of equal length
Fig.22. Flue duct length - side
L
Flue
turret
assembly
Terminal
assembly
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