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double doors inside, foam glued to doors.	double doors outside, foam strip glued to jamb to flush against door when closed.
emergency door inside, foam glued to door.	emergency door outside, foam strip glued to jamb to flush against door when closed.
empty bays have foam cores with cardboard overlays, fan bays have cardboard shrouds, I need to beef them up a bit, the next time the temp really drops.