Company that's building a new bathroom for me in an old house has broken the old heavy duty sewer vent pipe and added a plastic pipe to it by turniung it away from a usual path by making a turn across the bathroom and then up to the ceiling and then 90 degree turnhorizontally above the ceiling in the attic and then another 90 degree elbow into the old line vent which goes out up into the roof and out. Sorry for bad English. They made this complicated "pipe dance U turn" because it was convenient for them and not for me or the air, and of course, I'm paying for all the extra piping they've used for it. Plus a lot of space wasted just to make this "U wrap". I have a Home Improvement book and in the pictures the vents always go straight up. The way the pipe goes now instead of connecting the one below the floor and the one above the floor directly they made a 90 degree elbow and "sent" a pipe horizontally all across the bathroom below it's floor and then up in the corner inside of the bathroom and then elbow above the ceiling and then horizontally back into the same position, then yet another elbow into the old "cast iron??" one which comes out in the roof. What I mean is - can they do this? Can they instead of vent pipe going all the way between under floor until the outdoors all the way up straight, can they make it "turn" by elbows in 4 places? I mean they made the new vent pipe "snake away" in 4 elbows (!). Is this usual? Thanks for your help.