Bore Size: Interchangeable Hub Diameter: 18.000" Blades: 2 Pitch: less than 27 degrees 2 Blade, Interchangeable Hub, Condenser (Pressure) Type Fan BladeBlades: 2Rotation: CounterclockwiseDiameter: 18 InchesPitch: 27 degrees 0 Inches Static Pressure: CFM = 2400, BHP = 0.0830 Inches Static Pressure: CFM = 870, BHP = 0.11Maximum RPM: 1725Typical Applications: Air-Conditioning Condensers, Power Roof Ventilators, Heat Pumps, Heat Exchangers, Unit Heaters, Commercial and Industrial Equipment.