I am just about to start to finish my basement. We bought the house nine months ago and had a "two piece rough in" put in. There are 2 pipes coming out of the floor. One is about 4 inches (I am guessing for the toilet) and another pipe that is about 2 inches. I am not sure what they are for and if this has to be vented. There is only one other pipe in the floor (not very close and I believe it is a clean out.) Any help/ideas would be great. Thank you.
MF
MF