EME620DD is a 6-inch deep, horizontally-bladed, stationary louver designed for generator rooms or other spaces that require safety equipment to continue running during a storm event. Mechanically-fastened or added strength with double-drainable blades and offers protection against water, air and wind penetration during severe weather conditions. The low-maintenance louver features 48 percent free area and corrosion-resistant, extruded aluminum construction.