I'm about to do some calculations for a sprinkler system in a parking garage (OH2). This system follows EN 12845 (design of automatic sprinkler systems), but I'm sure the procedure for what I'm about to ask is quite similar in NFPA as well. I need to determine the system's most unfavorable location, and I'm not quite sure how to do this. Just by nature of the design I have a pretty good idea of where it will probably be, but is that a good enough reason? There is a chance it might be somewhere else, so unless I do several calculations of different areas I won't know for certain. Is it ok to assume where it is and calculate that area?