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You mean change the stack with AAV to vent it through the roof? If thats what you mean, I dont think i would be able to do that. I know the regs say minimum 75mm but if only a section of the pipe is say 40mm or 50mm, would it make a huge differennce to airflow?

is there a reason for it to be at least 75mm? If i reduce it, it would be just from floor boards to ceiling and then it would go back to 110mm from loft to roof. Is that something i can do at all or a no go?

75mm is still going to be too big. is it not just for the gases to escape and air to enter.......can it not be reduced to 40mm or 50mm? Sorry not sure what you mean by changing the AAV of other to 110mm as i think its already 110mm.

Hi, I have a, what I think is a plumbing vent pipe in the loft. Its going through a boxed in space within my ensuite behind the existing shower space. I want to open the space and extend the shower area but this pipe is in the way. It is quite big too. Is there any way I can reroute it or make...