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Figure 4 – Connection of condensate drainage pipe to external soil and vent stack
Key
1 Boiler 7 450 mm minimum up to three storeys
2 Visible air break 8 Minimum internal diameter 19 mm
3 75 mm trap 9 Pipe size transition point
4 Visible air break and trap not required if
there is a trap with a minimum condensate
seal of 75 mm incorporated into the boiler.
10 Minimum internal diameter 30 mm
11 Water/weather proof insulation
5 Soil and vent stack
6 Invert
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