lsuleigh,
If your scenario is ambient heating only, it is acceptable by established industry practice to NOT provide calculations and to install a small PSV. I have seen "small PSV" being a 1/2" to 1", with 3/4" being the most common. Therefore, IF your scenario is ambient heating only, what you are doing may be a waste of time.
Since you are new to this forum and you did not describe what you want the data for, I thought I'd add this. It may not apply. If it does not, sorry!
Good luck,
Latexman