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18-28-508.2  Compensating hoods.
   Manufacturers of compensating hoods shall provide a label indicating minimum exhaust flow and maximum makeup airflow that provides capture and containment of the exhaust effluent. A minimum of the first, four feet of makeup air duct starting at the hood shall be of the same gauge as the exhaust duct. A fire damper shall be installed between the heavier- and lighter-gauge ductwork.