The cages are designed to suit all applications.
The fixed option allows for a back panel to be added this allows the unit to mounted anywhere, not necessarily against a wall. The addition of the back panel completely boxes in the condensing unit allowing you to position the unit in the most unobtrusive aesthetically pleasing site.
The wall mounted option is a standard cage, its back frame bolts to the wall and then using the unique click and slot system the side ,front and top panels are assembled. Four screws complete the construction . The simplicity of construction of the cages make positioning at any height much easier than others and in most instances would require only one person.