News wrote:
"Tom" wrote in message
...
What's the minimum size I can get away with for a stack ventilation
pipe on a single storey dwelling, it serves only for ventilation. It
used to be 75mm but I haven't got access to the latest approved
documents.
Cheers
Tom

Use HepVO traps and no vent pipe at all.
http://www.hepworthplumbing.co.uk

This is the main stack and is located external to the building, it's not a
secondary stack.
I don't think that the Hep VO traps apply, please advise me if you think the
statement incorrect.
Cheers
Tom