The ELC6375X Adjustable Louver is 6" deep and has a 37 1/2 degree blade angle. It features: • 54% free area. • Low torque operation and architecturally pleasing appearance with low leakage performance. • Drain gutter in the head frame; downspouts in jambs and mullions to drain water from louver for minimum water cascade from blade to blade. • Concealed blade linkage that is protected from weather exposure and reduces required installation depth. • Jamb seals that provide tight blade-to-frame closure.