Downpipe
[1] Section of Vertical pipe in a pipework connecting a collector pipe to a Siphon break or to the point of discharge from a Siphonic system.
[2] A pipe for conveying rainwater, either externally or internally, from a roof or other parts of a building.
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References:
- BS 8490:2007
- AS 1273-1991 UPVC downpipe and fittings for rainwater