Review on 🌬️ WINSINN 80mm USB Fan 5V Dual Ball Bearing Brushless - Efficient Cooling for PC, CPU, Set-top Box, Router, DVR, PlayStation, Xbox - Pack of 2Pcs by Kanwar Mix

These are very very quiet 80mm fans for use where you can hear the fans in the case. The airflow is moderate. So if you have a lot of heat to vent, you may need to use both. I have a medium sized server with a NAS rack for home office and media center, so I need to use 4 (two pairs) of these fans - 2 for exhaust and 2 for rack airflow. It's nice that they are quiet since the server/NAS rack is in my office. My HP desktop computer fan and power supply are louder than 4 of these fans.