Hello ... see picture, hopefully it attached as this is my first post. I apologize if the picture is somewhat crude as I hastily put it together. I am rough plumbing a new bathroom over a garage, and I would like to stay inside the 16" wooden i-beam joist cavities versus having pipes inside the garage space. Can this fitting (3" PVC DWV Wye and 45° Elbow Combo w/ 2" L Side Inlet) be used in the horizontal plane, with the 2 inch side inlet straight up to connect a 2" dry vent pipe for the Water Closet? I am finding it difficult to keep the dry vents from going horizontal before it's 6 inches above flood plane, especially with limited vertical walls to work with. I am not sure if the vent inlet being straight versus 45 is an issue, although it will strictly be a dry vent with no drainage at all. I thought about using a 3-3-2 wye, but the extra clearance for the vent is a problem. Hopefully I am clear, and the picture comes through. FYI, I am in NH and we follow IPC. Thanks in advance for any advise ... this forum is a great resource!