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Combi V3, Combi Max and Vortex Combi models
5 - GENERAL BOILER INFORMATION
3 The flue terminal must be at least 600 mm from
any opening into the building, and 600 mm above
any vertical structure or wall less than a horizontal
distance of 750 mm from the terminal. See Fig. 13.
4 If an existing chimney is used, it must be lined with
a smooth bore stainless steel liner for use with oil
fired condensing boilers. The top and bottom of the
annular space must be sealed.
5 If a rigid flue is used externally, it must be of the twin wall
type incorporating seals, must have a stainless steel inner
skin and be suitably insulated and weather proofed.
Fig. 13 - Vortex Combi typical conventional flue with brick chimney
6 The internal flue diameter for all models must be
100 mm (4 in).
7 Twin wall flues are recommended for externally
run flues to reduce the possibility of the condensate
freezing in the flue.
8 The exposed flue pipe between the boiler and the
chimney must not be of an asbestos material and
aluminium must not be used in any part of the flue. Only
stainless steel should be used.
9 If the draught conditions are satisfactory, the flue
should terminate with a standard cowl.
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