203.6mm deep extruded aluminum construction; frame with channel profile; corner joints mitered and mechanically fastened, with continuous recessed caulking channel each side; intermediate mullions matching frames; gutters rated for water penetration maintained effectiveness rate tested in accordance with AMCA 500-L. The sand louver panel is tested for sand rejection and air performance as per AMCA-500L standard. Moreover, horizontal louver is tested for air flow & water penetration as per AMCA-500L standard.