STEPLESS CONTROLLER: Small 120mmx4 computer fans with speed controller,wide range of speed choice,you can easily adjust the speed from silent(1000rpm) to high speed(3000rpm) according to different applications. BIG AIRFLOW 93CFMX2: The AC powered 480mm fan with full speed 3000rpm around 93cfmx2 (while others are 2500rpm 85cfmx2) for those who need high power fans. LONG LASTING DUAL BALL: High speed 480mm brushless ventilation fan with dual ball bearing provide longer lifespan up to 6000 -100000

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