GDSTIME 4 x 120mm fans 230V Double 240mm fans 230V Adjustable Dual Ball Bearings Fan 220V Case Fan 4V -12V Adjustable Speeds High Airflow for Servers Inverter Cabinet

["[DIY Fan set] You can use 2 pieces of 240mm x 120mm x 25mm fans separately, or install 4 fans of 230V 120x120 as a square fan set, or install all fans in a long strip. They provide more options for the DIY fan set as needed.","[ High Airflow 230V Fan ] 4 x 120mm fans, operating at a high fan speed of 2500 RPM (per fan) x4, produce a large airflow (83.2 CFM x 4), suitable for laptops, cabinets, workstations, amplifiers, routers, server ventilation outlets fan exchange.","[ Double Ball Bearings ] All 230V 120mm fans have double bearings, with a lifespan of 50000 hours at 25 ℃. Furthermore, metal grilles are installed on both sides of the fans to protect fan blades, cables, and fingers. The buyer can use the 120mm fan safely without blocking airflow (but we do NOT use the fan in wet environments)","[ Adjustable 230V Fan ] 220V AC powered fan speed controller. You can adjust the input from 4V to 12V to achieve different fan speeds, airflow, and noise levels for various environments or purposes.","[ 220V 120mm pc fan with More Accessories, More Choices ] We provide a speed controller for adjusting fan speed, silicone foot pad set for noise reduction, metal brackets for the DIY fan set, as well as a package with various brackets and screws."]