Re: bath wastes sizes
tees with 1/1/2 durgos in line to entrain air into the run. We did a very large house that had a ring beam plate steel grid on top floor so all wastes had to been run above the floor and the architects decided they didnt want to see soilpipes on the front of building. Same silly twats or won designer of the year on C4 Grand designs by the way. We had 50mm runs in excess of 7 mtrs and all worked fine.
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