Chris, thanks, 100% of your tone and physics makes sense to me and I have
only two questions left: 1) Why just +50 feet for sprinklers in the 1st
place, but another 3X that if you add something that doesn't work with them?
2) Why not +150 feet, no auto vents, for any approved head? Let the owner
decide how much product it is willing to risk to smoke and heat damage per
event with smoke partitions (FPEs can do that calc with their bare hands).
And just to retain the mystery that remains unsolved til bid time, let the
local  fire department vote on many manual vents it is going to want.

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