The 2x NMB 3110RL-05W-B69 DC 24V 0.21A 8cm Industrial Control Cooler Fan Twin Pack is a set of high-quality fans specifically designed for industrial control systems. With a voltage of 24V, these fans are reliable and efficient in cooling and maintaining the temperature of the computer components. The NMB brand is known for producing durable and long-lasting cooling solutions, making this twin pack a practical and effective choice for any industrial control system.