Dave,
We've moved beyond Barry Manilow here in South Texas (but that was funny). If you want to listen to some really good music and stream it into your computer, listen to
. The program director is a good friend of mine.
As to the problem at hand, technically the enclosure would require sprinklers, as you indicated based on the threat of exploding animal parts in freezers. However, I recall that FM would exempt certain freezers and coolers when the insulating material was evaluated by FM for heat release rate and interior finish fire performance, and the insulating material was separated by a thermal barrier. You may be able to apply a similiar logic if it can be demonstrated by the manufacturer.
In the day when I was a responder, I was required to undergo an annual physical and toxics screening and as a part of this examination, I was subjected to an auditory test. I seem to recall that everything in the booth was essentially 24 VDC and any of the equipment that could contribute as an electrical source of ignition (110 VAC) was outside the booth. So yes, it technically requires sprinklers, but the probability is so low given the lack of ignition sources and available fuel in the typical booth that not many people consider them to be that great of a hazard.
In the end it would just be easier to drop a 1/2 inch SR sprinkler in the enclosure and call it compliant. However, you asked the question so I offered you my opinion.