I want to extend an internal soil pipe to vent out above the roof. Does the pipe have to be 110mm the same as the rest of the system or can I use a smaller diameter pipe? There is no other other vent to atmosphere in the system which goes to a septic tank. thanks.
soil ventilation
- Thread starter calvert
- Start date
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b.c have allowed svp's to be reduced to 65mm rainwater size in the past, so i can't see why not.
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