Part number 907238-001 is a rear system fan manufactured by Hewlett‑Packard for use in the Z4 Gen4 workstation. Designed to fit the rear mounting location, this fan helps maintain optimal airflow and cooling performance within the workstation chassis. It is intended for integration during system assembly or as a replacement part to ensure continued thermal management of internal components. The fan is compatible with HP Z4 Gen4 models and supports standard power and connector interfaces used by HP workstation fans. It provides reliable cooling support to help sustain system stability and longevity.