GAF 60 mil TPO roofing System installed over boiler room

Should a GAF 60 mil TPO roof be installed over a boiler room attached to a dry cleaning plant?

Sure, as long as you have ventilation and the heat on the roof is not extreme. Keep in mind that the roofing system is, basically, a vapor barrier and would hold in some moisture. Having said that, it is really the system you need to worry about, not the roofing membrane.

Depends on the temp in the boiler room, the type of deck, thickness of insulation, and possibly a couple other factors.