Amazon.com: ARCTIC F14 Silent - 140 mm Case Fan, Ultra-Quiet, Extra Quiet Motor, Computer, Almost inaudible, Fan Speed: 800 RPM - Black, White : Electronics
Amazon.com: ARCTIC P14 Slim PWM PST - Case Fan, 140 mm, with PWM Sharing Technology (PST), Pressure-optimised, Quiet Motor, Computer, Extra Slim, 150-1800 RPM - Black