I am working on roughing in the plumbing for a master bathroom and have a question about running my 3-inch PVC. I cannot run directly to my main stack because I have ductwork in the way. My only other option is to run around my basement which leaves me with a straight 20 foot run, then a 90 degree angle, followed by another 20 foot run and another 90 degree angle into my main stack. I can obtain more than ¼†per foot of slope throughout the entire run. I will be able to tie in a vent about three feet from the start of my run. Any advice or information on the possibility of this working would be great! Thanks!