AS Axis Spindleon 4020 12V PWM 4 Wire Cooling Fan 40 x 20 mm Compatible with MagLev Replace OEM MF40201VX-1Q120-S99

- Fitment: 40 x 40 x 20 mm 12V 4 wire PWM fan for devices requiring this size and connector; verify hole spacing and 4 pin plug before purchase and install. - Cross Reference: Replace OEM MF40201VX-1Q120-S99; match this code to frame size, voltage, and 4 wire layout for an accurate fit and easy swap. - Performance: PWM speed control enables adjustable airflow while the tachometer lead reports RPM for system monitoring; Compatible with MagLev bearing systems originally using similar fans. - Applications: Electronics cooling for boards, enclosures, mini PCs, switches, NAS, 3D printers, DVRs, and router bays; quiet low speed under light loads and higher airflow as temperatures rise. - Use Cases: Ideal for repairs, DIY builds, embedded systems, cabinets, instrument panels, and project boxes where a 12V 4020 fan is specified.