Ensure optimal cooling and performance for your Bitcoin mining setup with the MARTECH 7K RPM Cooling Fan. Designed for high-performance operations, this fan features a powerful 7,000 RPM speed and a unique 4-pin square connector, making it the ideal replacement or upgrade for Antminer models including the S19k Pro, T21, S21, and S21 Pro. Engineered for efficiency and durability, this cooling fan ensures stable temperatures for intensive mining activities, enhancing the longevity and reliability of your mining hardware. Its robust construction and precise airflow management make it an essential accessory for maintaining peak performance in demanding mining environments. Whether you're replacing a worn-out fan or upgrading your rig for better cooling, the MARTECH 7K RPM Cooling Fan offers the perfect solution for Antminer S19k Pro and S21 series miners.