Even the simple basic (VERY BASIC) standard plumbing code Chapter 8 section 801 deals with this type of discharge.
If you want you can send me a private E mail and I am sure of my list members can help you in this area.
Have you considered the possibility to over size the waste and vent piping and asking the powers that be to allow you to use a single vent stack with branches above the flood level of the units in question?
The intent of the code is to set up minimum standards of protection.
If you can calculate your condensate rate and figure 1 GPM = 1 FU as per most MODERN countries and area’s where they have legitimate codes then you could size these lines hydraulically saving lots of roof penetrations and taking a heck of a chance of oscillation from l these roof openings causing trap seal losses
[Edited by SylvanLMP on 24 April 2001]
[Edited by John Aldrich on 25 April 2001]