12.8″ deep fixed chevron blade with woven glass fiber acoustic infill ;in extruded aluminum construction; frame with channel profile and mechanically fastened, with continuous recessed caulking channel each side; tested to ASTM E90-04. STC-20 and OITC-13
AIRFLOW PERFORMANCE
Free Area : 23.4% based on a test sample of 48in (1220mm) x 48in (1220mm) Discharge loss coefficient Classification—Class 4