Prep Guide 2020 #122

VN: For Problem 122, I wanted to check if I was breaking down the solution properly.  I'm not seeing the end solution of EH1 in NFPA 13 Table 13.2.1.

Could you take a look at the assumptions below and let me know if I'm missing something or assuming the incorrect storage configuration?

Below is the information extracted from the problem statement:

synthetic fiber (less than 50/50) - Class III (NFPA 13 Table A.5.6.3)
natural fiber clothing - Class III (NFPA 13 Table A.5.6.3)
rayon - Class IV (NFPA 13 Table A.5.6.3)
unexpanded plastics 

Since movable racks, treat as multiple row rack storage.  Storage directly on shelves more than 50% open, so exposed storage. Storage height 10'6".

Assuming unexpanded plastics as the worst case, I'm ending up at either OH2 or EH2 depending on max ceiling height which isn't specified in the problem.