[Histonet] Flammable / explosion proof refrigerator

[angela smith]

What is the criteria for volume and NFPA rating of a reagent for a flammable / explosion proof refrigertor?
 
I know many of us do not have the necessary refrigerator, but I would assume there should be some kind of criteria or "rule" to help justify getting an equipped refrigerator  for flammable refrigerated reagents.
 
Please let me know some facts!
Thanks
Angela