The LC6375D Combination Louver has front stationary blades and adjustable rear blades in a 6" frame. It has a 37-1/2 degree blade angle and features:
• Tight shut off in air intake and exhaust applications.
• Drain gutter in each front stationary blade and downspouts in jambs and mullions for minimum water cascade.
• Architecturally styled hidden mullions allowing continuous line appearance up to 120".