Everflow 40x40x10mm PWM Ultra High Speed Dual Ball Bearing Fan-R124010BU

Everflow 40x40x10mm PWM Ultra High Speed Dual Ball Bearing Fan-R124010BU AF 840556104315 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). Operating Temp: -10-70C, 4-Pin PWM Controlled Fan Connector w/8" Tail. It is RoHS compliant. PRODUCT SPECIFICATION: DC Fan Size: 40x40x10mm, Bearing Type: Ball BearingFan Speed: 8000 RPMNoise Level: 39.3 DBARated Voltage: 12 VoltMax Airflow: 9.27 CFMLife Expectancy: 50,000 hoursProtection: Current limit/ Impedance