Ultra-Quiet 23cm PC Case Fan for Maximum Cooling – Easy Installation, High Airflow
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
Amazon.com: Saim 12V 2 Pin Sleeve Bearing Cooling Fan for Computer Case 12cm x 12cm x 2.5cm : Electronics