Firestop Sheet, Fire Rating 3 hr, Fire Resistance Type Intumescent, Firestop Type Gasket Insert, Overall Width 0.25 in, Roll Length 3.69 in, Color Black, Features Dielectric Breakdown Voltage 22V/Mil, Non-Conductive, Flame Spread Index 5, For Use On Electrical Boxes, Outer Material Intumescent, Resistance Properties Fire Resistant, Sheet Length 3.69 in, Smoke Developed Index 5
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