Spire Circular 95x95x25mm 12 Volt PWM Fan SF09025SBH4W2-PWM
Spire new PWM series silent fan
Pulse Width Modulation (PWM) is a common technique for speed control which can overcome the problem of the poor starting performance of a motor.
PWM for motor speed control works in a very similar way. Instead of supplying a varying voltage to a motor, it is supplied with a fixed voltage value (such as 12V) which starts it spinning immediately. The voltage is then removed and the motor 'coasts'. By continuing this voltage on/off cycle with a varying duty cycle, the motor speed can be controlled.
Fan Dimensions: 95×95×25 mm
Bearing : Sleeve bearing
Rated Speed: 1000~2500 RPM +/-10%
Rated Power: 2.04 W
Rated Voltage: 12 V
Noise Level: 27 dBA
Air Flow: 48.46 CFM
Current: 0.17 A
Connector: 4 Pin PWM 9 inch tail
NOTE: PWM Fans are not variable speed control fans on their own. An integrated circuit varies the speed and airflow of a fan using a pulse-width-modulated (PWM) voltage in response to temperature or system commands send typically by a computer motherboard. You can use them to run at full speed from an external supply if you adapt the plug. (PWM Adapter Cables)