3x I used a 9V power supplyAt 5V, the Noise range was 13dB at 12V and could be heard at 30dB. So I used a 12V power supply with regulation from 5V-12V to 9V and reached 20dB, almost inaudible:The rest are 3x Silentium Fan 12 PRO fansTechnical datamax. speed 1200 rpm.max. volume 13 dBmax. air flow m³ / hour 90max. airflow CFM 51supply voltage 5 - 12 Vtype of FDB bearingplus one 80x80 noname about 1600rpm
Left 85WatRight 150Wat=235Wat
3x I used a 9V power supplyAt 5V, the Noise range was 13dB at 12V and could be heard at 30dB. So I used a 12V power supply with regulation from 5V-12V to 9V and reached 20dB, almost inaudible:The rest are 3x Silentium Fan 12 PRO fansTechnical datamax. speed 1200 rpm.max. volume 13 dBmax. air flow m³ / hour 90max. airflow CFM 51supply voltage 5 - 12 Vtype of FDB bearingplus one 80x80 noname about 1600rpm