I am using the san tee upright with flow comming into the top ( not horizonal, I wouldnt do that). I normally use a wye with a street 45 to bring the angle up to a 90. This may be fine to use. I was told always to use wyes not san tees. The san tee is a much lower profile than the wye with a street 45. This is a tight spot in joist bay to sub floor. Man I have to get some software with fittings and stuff. Anyone know where I can get that so I can Illustrate some things.