Amazon.com: Noiseblocker BlackSilentPRO PC-P - case Fan : Electronics
ASUS ROG Strix XF120 Whisper-Quiet, 4-pin PWM Fan for PC Cases, radiators or CPU Cooling (120mm, up to 400,000 Hours lifespan, Magnetic-Levitation, 1800RPM) - Newegg.com
Ultra-Quiet 23cm PC Case Fan for Maximum Cooling – Easy Installation, High Airflow