Panel Fan Assembled Assembled Blade Diameter 24 in Blade Material Steel Drive Type Direct Drive Duct Diameter Not Applicable Exhaust Airflow @ 0.000 in SP 5 520 cfm Frame Finish Powder Coated Frame Material Steel Guard Finish Chrome Guard Material Steel Guard Type Intake Hazardous Location Class Class I Div 1 Group C and D Class II Div 1 Group F and G Maximum Airflow 5 520 cfm Maximum Noise Level 30 sones