re: Wal Mart Sprinklers

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Either way, the sprinklers are definitely zoned in buildings that big. However, as soon as hot air/smoke/etc pop a sprinkler, every sprinkler in the zone goes off. Probably a good thing as to help prevent the spread of a fire

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There are no electrical controls beyond the flow sensors used to determine when to roll the Fire Department. Heat pops a head in a line that's filled with water (or compressed air to be released and followed with water). Heat below the head - it pops and pours water. No heat - no flow. They are not "zoned" to release together.

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I thought smoke ruined the entire inventory, not water damage.

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This is usually what happens during a fire. Product in the store is exposed to smoke and soot. Any product affected with have to be removed.