Panel Fan Assembled Assembled Blade Diameter 18 in Blade Material Steel Drive Type Direct Drive Duct Diameter Not Applicable Exhaust Airflow @ 0.000 in SP 3 200 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 3 200 cfm Maximum Noise Level 23 sones