Amazon.com: ARCTIC F9 PWM PST CO - 92 mm Case Fan with PWM Sharing Technology (PST), Dual Ball Bearing for Continuous Operation, Quiet Motor, Computer, Fan Speed: 150-1800 RPM - Black : Electronics
Amazon.com: AABCOOLING Super Silent Fan 14 - Silent and Efficient 140mm Fan with 4 Anti-Vibration Pads, CPU Fan, Silent Case Fan, PC Fan 140mm, 12V : Electronics