ian17 wrote:
hi i'm just looking for some help please,i've got a vent at the top of
my roof that has two 5inch pipes coming down from it that then go into
the wall that joins my flat to my neighbours,my only thought was that it
serves to vent a space between our flats,that's if they even have a
cavity between the blockwork??you'll have to forgive my ignorance,if
possible i'd like to remove them




How old is the building?

It sounds to me like they are the vent stacks for the plumbing. If so, they
probably go all the way down to the basement and tie into the main sewer
pipe.

Regardless of what they are, why do you want to remove them?