Delta Electronics THA Series DC Axial Fans are designed for high performance to cover two fans in serial while producing less vibration than similar fans. In addition to rotor blades, the THA series features stationary blades to regulate high-density air flow. THA fans include a finger guard, a reliable ball bearing system, and are available in a die-cast aluminum frame. Other features include a high impedance system, PWM signal speed control, and speed signal output. These fans are ideal for telecom and industrial applications. Voltage - Rated 12VDC Air Flow 20.6 CFM (0.577m³/min) Bearing Type Ball Fan Type Tubeaxial Features PWM Control, Speed Sensor (Tach) Noise 52.0 dB(A) Power (Watts) 5.16W RPM 15600 RPM Termination 4 Wire Leads FEATURES Provides high airflow in a high impedance system Low vibration PWM signal speed control and speed signal output