How far can a Durgo (AVV) be from the main vented stack?

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HI,

Can anyone tell me if there is a maximum distance a Durgo (AAV) can be on a secondary stack (from a new ensuite) that feeds into the main vented stack? Is there a maximum distance?

Presently I am looking at around 10m between the durgo on the secondary stack and the vented stack.

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Second Question:

If i dont have a durgo i will have to vent outside and the problem is that the velox window for the ensuite is close to the gutter height outside. Can I move this new vented pipe sideways then bring it up over gutter height further along the roof where there is no velux window? If so how far can I go, is there a limit?

Thanks for any help. :confused:
 
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