I've tried to sketch out what I think would make sense for plumbing, but I have no idea if this is appropriate or not. I realize that I have no vent in this room, so was considering using a SureVent under the sink. My logic being that it would vent the washer pipe at the same time since it is "above".
Is this type of layout allowed / legal? The large 4" leaving the room ties into the main 4" running under my slab just outside my bathroom and just before the BWV that protects the bathroom fixtures (hence the desire for another BWV in this room).
If this generally okay, does it matter that the floor drain doesn't have its own vent?