41
IND GUIDE INST 10-11
HHIC REF T11/0027BRev8
Figure 5
–
External termination to rainwater downpipe (NB only combined foul/rainwater drain)
Key
1
Condensate discharge pipe from boiler
7
Air gap
2
Pipe size transition point
8
68 mm
PVCu strap-on fitting
3
Water/weather proof insulation
9
Minimum internal diameter 19 mm
4
43 mm 90° male/female bend
10
Minimum internal diameter 30 mm
5
External rain water pipe into foul water
11
End cut at 45 °
6
External air break
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