Tubeaxial Fan, Blade Diameter 30 5/8 in, Maximum Motor Horsepower 1 1/2 hp, Minimum Motor Horsepower 1/4 hp, Maximum Motor Speed 1,611 RPM, Minimum Motor Speed 694 RPM, Maximum Airflow 40,000 cfm, Minimum Airflow 3,285 cfm, Maximum Static Pressure 2 in...