4 Blade, Interchangeable Hub, Condenser (Pressure) Type Fan BladeBlades: 4Rotation: ClockwiseDiameter: 18 InchesPitch: 27°0 Inches Static Pressure: CFM = 2490, BHP = 0.1230 Inches Static Pressure: CFM = 1510, BHP = 0.18Maximum RPM: 1725Typical Applications: Air-Conditioning Condensers, Power Roof Ventilators, Heat Pumps, Heat Exchangers, Unit Heaters, Industrial Equipment