Panel Mounted Hazardous Location Exhaust Fan Assembled Assembled Blade Diameter 20 in Blade Material Aluminum Control Type Rotary Dial Drive Type Direct Drive Duct Diameter Not Applicable Exhaust Airflow @ 0.000 in SP 3 640 cfm For Cut-Out Height 24 in For Cut-Out Width 24 in 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