LG TWC226NBAB5 Mode D'emploi page 12

Installation
How to Use the Reversible Inlet Grille(For Some Models)
The grille is designed to clean the filter both upward and downward.
b
(a) (b) (c)
A. Before attaching the front grille to the cabinet, if you want to pull out the filter
upward;
1. Open the inlet grille slightly (a).
2. Turn inside out the front grille (a).
3. Disassemble the inlet grille from the front grille with separating the hinged part by inserting a straight type
screw-driver tip (b).
4. Then, rotate the inlet grille 180 degrees and insert the hooks into bottom holes of the front grille.
5. Insert the filter and attach the front grille to the cabinet.
B. If you want to pull out the filter downward;
The grille is already designed that way.
12 Room Air Conditioner