Pipe through a Room
 

Hello,

i am currently trying to a mesh a pipe that is goind through a room.
I attached a picture of my Geometrie and the Blocking and mesh.
The Pipe goes through the wall. The Problem is that, although I created an O-Grid inside of the pipe, the End will not be meshed. I guess there is a problem with the meshing of the whole room. The Blue wall is the Inlet! I named the Green Parts as "Wall".

How could I fix this?

Thank you!