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MC § 504.8.2
Exhaust ducts shall be supported at 4-foot (1219.2 mm) intervals and secured in place. The insert end of the duct shall extend into the adjoining duct or fitting in the direction of airflow. Ducts serving a single appliance shall not be joined with screws or similar fasteners that protrude more than 1/8 inch (3.2 mm) into the inside of the duct.
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