Where should I vent this? (image)
	
	
		I recently installed new plumbing in my basement for a bathroom I'm finishing which is directly under the 2 upstairs bathrooms.  Can I vent the pipes where I have it labeled?  Keep in mind, the pipes are already cemented in and the main line where I have it marked is accessible but the vent would have to go out of the side of my hous by my air conditioner.  Also, I can't find a vent for the bathrooms upstairs but I assume they are in the wall where I can't see them.  THANKS in advance!! 
http://www.mcgregorracing.com/images...ingDrawing.jpg