HP Elite 8300 Series Convertible Minitower Maintenance And Service Manual page 204

7. Pull the assembly toward the rear of the unit (2), and then lift it out of the chassis.
Figure 8-30
To install the front fan, reverse the removal procedure. Be sure to orient the air flow into the unit.
192 Chapter 8 Removal and Replacement Procedures Small Form Factor (SFF) Chassis
Removing the front fan