Pipes through the joists

[King_al]

Hello,

I'm in the process of replacing the ceiling and installing new electrical cables when I discovered a large black pipe made of cast iron? The pipe goes through all the beams. Feels a bit weird? Does anyone know what it is?

It has probably been there since the house was built in 1976.

 

[nimhed]

Ventilation of the drain, I guess. Can't you see where it starts and ends?

 

[King_al]

Starts on one short side and ends on the other. There doesn't seem to be any drainage pipe connected to it. Ventilation for drainage was also my guess.

 

[nimhed]

But then it's probably an old vent that has been decommissioned and they haven't bothered to remove completely.