That's what the books say . How it is applied by location is on someone else .
Yes , the bulk of my immediate reference is in the commercial context , however , the guy that I've been hanging out with since the 4th grade is a local Fire Inspector so I also have sort of a feel for how things get looked at from inspection , enforcement , and doing . As I type this I'm standing about 150 ft from enough materiel to probably raze the average mall to something resembling leach field stone . So materiel handling and storage are in my best interest but 156# of powder and 40# of primers is chicken feed . However T Rex was an over grown chicken and very likely could total a garage looking for a cotton tail . So grain of salt . The idea is to not confine the the gas expansion and not pass the heat , flame or concussion on to another cell or the structure . The modern fridge has a magnetic seal vs a mechanical latch , viola' blow out wall . It is insulated to reduce the heat transfer , bonus points . The average guys and I'm sure there are a couple of over achievers right here won't have much over 70# over marked containers several will be partials and I'd almost bet that that the working cans aren't in the locker with the pre-planned bulk lots . 2 storage cabinets and a working bin at the bench , everyone is pretty much happy as a clam .