compartments designed to keep cooked food warm before serving.
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A large rack inside such a compartment would make sense because it would allow heat to circulate around dishes.
If the rack came from a built-in cabinet or drawer rather than directly from an oven cavity, this possibility becomes more interesting.
What About a Commercial Kitchen Rack?
Don’t overlook the simplest possibility.
The rack may not have anything to do with cooking at all.
Large wire shelves are incredibly useful