My rack mount case is silent enough to record with a high quality condenser microphone in the same room. But it is 4U with 120mm slow fans. Its all about how y

My rack mount case is silent enough to record with a high quality condenser microphone in the same room. But it is 4U with 120mm slow fans. Its all about how you build them. Obviously a 1U with 40mm fans running fast could make a lot of noise.