GE Zoneline 5200 Series Owner's Manual page 16

Slide the unit into the wall case and secure with
four screws through the unit flange holes.
If an insulated wall case is needed, see Install the
Wall Case and Exterior Grille section on the
previous page.
Reinstall the room cabinet by hooking the top
over the rail along the unit top, then pushing it in
at the bottom.
16