Cooler Master Silent 120 SI2 (4 in 1) Cooling Fan (R4-S2S-124K-GP) Size name:120mm   Case cooling is becoming more essential these days. The better airflow inside your system, the cooler and more stable system you will get.  Higher air flow to enhance cooling performance. Ultra silent operation at 19 dBA. Economic solution for perfect performance. RoHS compliance for protecting the environment.