120mm fan case fan rotations per minute 900 rpm max noise emission 11 db volume flow 7154 mh airflow 4211 cfm dimensions wxhxd 120 x 120 x 25 mm width 120 mm height 120 mm depth 25 mm fan bearing twister bearing operating power input 18 watt series enermax tb silence mtbf 100 000 hours port 3 pin leaf colour transparent frame colour black