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INSTALLATION OF THE VERTICAL AIR/FLUE DUCT
Fig. 5.1: Vertical Roof duct
24
Vertical air/flue duct
Accy. Vaillant Part No.: 303 800
Contents of the accessory:
• Vertical air/flue duct and terminal
assembly
• 48 mm air duct clamp
• Fixing bracket
The air/flue duct assembly may be
connected directly to the flue outlet
on top of the boiler.
In addition to the vertical air/flue
duct and terminal accessory, air/flue
duct extensions can be added to
increase the length of the flue.
Preparation
• Determine the installation site for
the boiler with reference to the
installation and servicing
instructions supplied with the
boiler.
• Ensure that all installation and
service clearances are available
and that the boiler flue can be
installed as detailed in these
instructions.
• Determine the point where the
vertical air/flue duct and terminal
assembly will penetrate the roof.
Please note: The vertical air/flue duct
and terminal accessory (Accy. No.
303 800) may be shortened. The
outer 'white' duct should be
shortened first, then the inner flue
duct cut so that it protrudes 4 mm out
of the air duct. In case of installation
directly to the boiler without elbows
or bends, it is essential that the roof
tile/collar is vertically aligned with
the air/flue duct of the boiler.
Pitched roof
• Determine the point of termination
of the vertical air/flue duct and
terminal assembly. Install the
adjustable pitched roof tile (1, fig.
5.2) in position.
• Fit the adjustable hood over the
roof tile according to the roof
pitch. The adjustable hood is
suitable for roof pitches from 25°
to 35°, or 35° to 45° by
reversing.
Flat roof
• Determine the point of termination
of the vertical air/flue duct and
terminal assembly.
• Make a hole in the roof of
120 mm diameter. Secure the flat
roof collar (1, fig. 5.2) to the roof
covering above the hole in
accordance with the codes of
practice for flat roofs (CP 144) to
ensure a
watertight seal.
Pitched and flat roof
installations
• From above insert the air/flue
duct and terminal assembly (5)
into the adjustable roof tile
(pitched roof) or roof penetration
collar (flat roof) until it is fully
seated. Adjust the vertical
alignment of the air/flue duct and
terminal assembly and secure the
air duct with the fixing bracket
provided (6).
• At this stage it is necessary to
prepare and fit the boiler onto the
hanging bracket – refer to the
boiler installation instructions.
• If the installation requires the use
of air/flue duct extensions,
additional bends or elbows please
refer to the sections on pages
25 – 27.
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