HP POD 20c Maintenance And Service Manual page 29

Removing the Rittal SK 3326 ventilation fan filter
Insert a screwdriver into the bottom right corner of the louvered grille and rotate it counterclockwise (1)
1.
to loosen the grille.
Grasp the louvered grille and pull forward to remove it (2).
2.
Remove the old filter (3).
3.
Replacing the Rittal SK 3326 ventilation fan filter
Insert the new filter (1).
1.
Close the louvered grille (2).
2.
Removal and replacement procedures 29