For a project within warm Climate Zones 0 to 3A, and that has a "metal shop" space that requires more than 15,000 CFM, is it a correct reading that the baseline system serving those spaces shall either be System 5 or 7 as stated in G3.1.1 d? It seems to me unusual the baseline would have a fossil fuel boiler given the climate zone. I am surprised that the exception gives a choice between 5 and 7, rather than say 5 and 6, for this reason. I also am surprised by the lack of definition of "laboratory space", but that is only secondary to my question.