The company is currently performing the assembly and testing in a different building. This will be a new building. I found out this morning that where they add the gasoline and test is NOT in the small service repair area. It is actually between the assembly area and the shipping/storage area. Basically a very large open area, with walls and air curtains between the assembly and inspection/storage areas. We will have three large makeup air rooftop fans and 3 rooftop exhaust fans for exhaust fume control. However, they do not pull their suction from down low because this is a pretty open area.
I am still trying to determine what NFPA code (if any) applies to this situation. I am more familiar with NFPA 497, but it does not seem to apply here. I have looked at NFPA 30 and 30A. The most applicable thing I can find that would seem to apply is 30A - Major Repair Garage because it includes fuel transfer or the "Incidental" use section of 30. Nothing seems completely applicable. I don't think the risk is the same as a Major Repair Garage, but I am not sure it is so low it can be ignored. All of our electrical equipment/devices are above 18", so it really won't matter for my design. I am really just trying to help my client understand the risks. They will use battery powered tools and fork trucks in this area. If I need to label this as a Div. 2 area up to 18", it will change how they operate and I don't want to do that if it is not necessary.