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9.6.1 Flue terminal locations
The terminal should be located where dispersal of combustion products is not unimpeded and with due
regard for the damage or discolouration that might occur to parts of the building in the vicinity (see fig
9.6.1.c).
In certain weather conditions condensation may also accumulate on the outside of the air inlet pipe. Such
conditions must be considered and where necessary insulation of the inlet pipe may be required.
In cold and/or humid weather water vapour may condense on leaving the flue terminal. The effect of such
'plumeing' must be considered.
The terminal must not be located in a place where it is likely to cause a nuisance.
For protection of combustibles, refer to IS 813 section 9.10.1. where the terminal is less than 2m (6.6ft)
above a pavement or platform to which people have access (including) any balcony or flat roof. The terminal
must be protected by a guard of durable material.
Where a terminal is fitted below a window which is hinged at the top, and where the hinge axis is
horizontal, and the window opens outwards, the terminal shall be 1m below the bottom of the window
opening.
If the boiler is to be located under stairs, a smoke alarm meeting the requirements of I.S. 409 or
equivalent must be fitted.
The flue must be terminated in a place not likely to cause a nuisance.
For horizontal flue terminal direct to the rear or side through the wall (only 1 bend
and 1 wall terminal) the terminal should be placed horizontal. The flue pipe inside
the terminal is fitted in a 3 degrees angle to ensure the condensation water can run
back to the boiler. See figure 9.6.1.a.
For longer horizontal sections, the outlet system should always be fitted on an
incline (52 mm/m = 3°) sloping down towards the boiler so that no condensation
water is able to accumulate in the outlet system. The chances of icicles forming on
the outlet is minimised by causing the condensation water to run back towards the
boiler. See figure 9.6.1.b.
Maximum straight length:
13m: iC 24/28
3°
Installation & Servicing instructions ATAG iR-Range
iR 12/15/18/24
6m: iC 36/40
iR 32/40
89mm
141mm 194mm
246mm 299mm 351mm 403mm 456mm 508mm 560mm
1m
2m
3m
4m
iS 12/15/18/24
iS 32/40
5m
6m
7m
8m
612mm
664mm
9m
10m
11m
12m
Figure 9.6.1.a
716mm
Figure 9.6.1.b
23
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