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Dissimilar metals plus moisture can destroy the mounting holes. Replace the fasteners with compatible hardware and isolation per the louver/environment spec.
['Aluminum, steel, stainless, copper, and galvanized metals do not all play nice together in wet or coastal conditions. The wrong fastener can eat away the louver mounting holes and weaken the frame.', 'Check the louver material, support material, environment, and fastener schedule. Remove corroding hardware, clean damaged areas, and use manufacturer-approved compatible fasteners, isolating washers, coatings, or separation tape as required.']
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