A minimum slope downwards towards the drain of 1 in 20 is essential. Freezing of the
termination and pipework must be prevented. Any drainage pipes outside the property
must be at least 32 mm inside diameter.
WD388/0/2004 Chapter 3 - Boiler Location The Keston C36 & C36P Combi Boilers
Installation & Servicing Instructions Page : 19
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