Noiseblocker NB-BlackSilentPro Fan P-P 80mm x 25mm Ultra Silent Fan, 500-2000rpm, 4 pin(PWM), 3.8-18 dBA, 10.59-32 CFM developed in Germany; position-invariant magnetic bearing NB-NanoSLI 2NEW! silent NB-EKA P2 Drive NEW!; Bayer Makrolon rotor with anti-dust technology weighted reinforced fibreglass PBT frame; NB cable management pluggable 20 + 50 cm connecting cables with high-quality textile sheath Screw set for vibration-free assembly and silicone sealing frame