EXHAUST/SUPPLY FAN, ASSEMBLED UNASSEMBLED, BLADE DIAMETER 48 IN, BLADE MATERIAL ALUMINUM, DRIVE TYPE BELT DRIVE, EXHAUST AIRFLOW @ 0.000 IN SP 30,022 CFM, FOR CUT-OUT HEIGHT 50 1/2 IN, FOR CUT-OUT WIDTH 50 1/2 IN, FRAME FINISH ZINC PLATED, FRAME MATERIAL STEEL, GUARD TYPE NONE, INCLUDES DRIVE PACKAGE, INCLUDES DEHUMIDISTAT NO, MAXIMUM AIRFLOW 30,022 CFM, MAXIMUM NOISE LEVEL 44 SONES