What is the size of the bathroom from the shower room and the outlet?
Can refer to the Atlas 99S304, P118-120, there are about 130mm, 140mm, 150mm, 210mm requirements, according to the product set, different products from the requirements will not be the same, in accordance with the norms have several dimensions for reference.
No specific provisions of it, taking into account the need to install the leak, generally about 20CM.
This look at how much you use the shower room, the general pipe before the connection should be good, or installed in the toilet where the mouth is generally 40cm, and talked about and let the floor from the ground to leak out