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1-inch water gage 16-foot wide affects air leakage Air leakage coefficients Air leakage data air leaked awenski block form burning black powder charge weight cinder-block and brattice cinder-block stopping coal mines coefficient of variation compressive strength core Hollow core dry wall dry-wall construction dry-wall stopping Explosive Charge face fly ash foam-coated brattice cloth Foam-Covered Brattice-Cloth Stopping gravel aggregate gravel block ground movement Hollow core Hollow hollow-core block hydraulic ram inches of water inches water latex latex-coated leakage through stoppings leaked less air masonry paint Metal lath newly constructed nylon oak timber pressure differential pressure required required to rupture roof rupture strength Rupture Test sealant Sheet stoppings shown in figure single block slag aggregate Stopping After Rupture Stopping Construction stopping width stoppings 6 feet Stoppings Air leakage STOPPINGS FOR VENTILATING stoppings subjected subjected to shock suspended charge trials uncoated brattice cloth urethane foam Wet wall wet-wall block stopping wet-wall construction