NetApp ASA C Series Install page 254

8. Slide the controller module out of the chassis and place it on a stable, flat surface.
Make sure that you support the bottom of the controller module as you slide it out of the chassis.
.
9. Place the controller module on a stable, flat surface.
10. Open the controller module air duct:
a. Press in the locking tabs on the sides of the air duct toward the middle of the controller module.
b. Slide the air duct toward the fan modules, and then rotate it upward to its completely open
position.
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Locking latch
Locking pin