Noiseblocker NB-BlackSilent Fan XS-1 50mm x 10mm Ultra Silent Fan, 3000rpm, 3 pin, 16 dBA, 6.77 CFM developed in Germany silent NB-NanoSLI bearing NEW!; silent NB-EKA P2 Drive NEW! Bayer Makrolon rotor with anti-dust technology;reinforced fibreglass PBT-frame NB-slics for vibration-free assembly 3000rpm Fan speed; 16 dBA Noise level; 6.77 CFM; 50mm x 50mm x 10mm