The ORION FANS part OD4020-12HB01A is a compact and efficient DC fan designed for optimal cooling in a variety of applications. With a size of 40x20mm, this fan is perfect for tight spaces that require effective ventilation. Powered by 12V and featuring a ball bearing system, this fan offers reliable and long-lasting performance. Equipped with an over-current (OC) tachometer, it provides accurate RPM readings for monitoring fan performance. With an impressive airflow of 7.5 cubic feet per minute (cfm), this fan ensures efficient heat dissipation, preventing overheating and prolonging the lifespan of electronic components.