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Model ECD-401 is an extruded aluminum combination louver-damper with drainable style blades and rear blade linkage, which allows ECD-401 to be manufactured in larger individual panel sizes than similar concealed linkage products. When in the open position this louver functions as a conventional louver while providing tight shut off from air and other elements when in the closed position. This product is most often provided with factory-mounted and adjusted electric actuators.

• 4-inch depth
• 48% free area (4 ft. x 4 ft.)
• 1,018 fpm free area velocity at the beginning point of water penetration