SHUTTER MOUNT EXHAUST FAN, ASSEMBLED ASSEMBLED, BLADE DIAMETER 24 IN, BLADE MATERIAL ALUMINUM, DRIVE TYPE DIRECT DRIVE, DUCT DIAMETER NOT APPLICABLE, EXHAUST AIRFLOW @ 0.000 IN SP 4,479 CFM, FOR CUT-OUT HEIGHT 25 IN, FOR CUT-OUT WIDTH 25 IN, FOR MAXIMUM WALL THICKNESS 6 IN, FOR MINIMUM WALL THICKNESS 3 IN, FRAME MATERIAL ALUMINUM, GUARD FINISH POWDER COATED, GUARD MATERIAL STEEL, GUARD TYPE INTAKE, HOUSING MATERIAL ALUMINUM, STEEL, HOUSING FINISH