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It is preferrable that only the flue terminal protrudes from the wall. However, where circumstances dictate, it is
permissible for the air duct (white tube) to be visible outside the property up to a maximum distance of 100 mm
(Fig. 18a), providing the flue is adequately supported and conforms to the appropriate sections of B.S.5440:1, the
boiler Installation Manual and flue guide.
If the flue is greater than 25 mm below a balcony, car port or similar the flue may protrude up to a maximum
distance of 500 mm 'V' (Fig. 18b).
Where the flue will terminate beyond a balcony, car port or similar and the distance between the flue and
underside of the balcony, car port or similar is only 25 mm at 'Z' it must protrude 100 mm 'Y' beyond the outer
edge (Fig. 18c).
Where the flue exits under a balcony, car port or similar in excess of 500 mm, the distance between the flue and
underside of the balcony, car port or similar MUST be 25mm at 'Z' and this can be achieved with the use of
elbows (Fig. 18d). It is also a requirement that the flue must protrude 100 mm 'Y' beyond the outer edge (Fig 18c.)
The horizontal 60/100 & 80/125 flue systems, including bends and extensions, are UV stable.
If any flue joint is external to the property, seal the joint with silicone sealant suitable for external use, not the tape
supplied.
The maximum equivalent flue lengths as stated in the appropriate boiler Installation & Service Manual must not
be exceeded.
The flue must always be installed with a fall of at least 1.5° from the terminal to allow condensate to run back to
the boiler.
Fig. 18a
800 System 2
2
Fig. 18b
NOTE: For clarity support brackets are
not shown in these illustrations.
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