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Single-skin metal can become a thermal bridge between outside air and conditioned space. Use the approved insulated blank-off/vapor-sealed detail to stop condensation.
['A plain sheet metal blank-off at an exterior louver can act like a cold plate. Warm humid indoor air hits it and condenses inside the wall or plenum.', 'Check whether the blank-off needs insulation, double-wall construction, sealed edges, and vapor barrier continuity. Replace raw single-skin patches with the approved insulated blank-off panel detail and seal the perimeter against air leakage.']
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