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MC § 604.8
Linings shall be interrupted at the area of operation of a fire damper and at not less than 6 inches (152.4 mm) upstream of and 6 inches (152.4 mm) downstream of electric-resistance and fuel-burning heaters in a duct system. Metal nosings or sleeves shall be installed over exposed duct liner edges that face opposite the direction of airflow, and all exposed edges, joints and seams shall be sealed.
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