This will depend upon the collection that you choose to use. Below are listed the depths and heights of each collection. The length (left to right in a straight line) can be calculated by your Fixturelite rep.
Collection 3000 Minimum Space Requirements
Depth 36"
Height 90"
Executive Minimum Space Requirements:
Depth 36.75"
Height 89.5"
Performance Minimum Space Requirements:
Depth 36"
Height 83"
Essentials Minimum Space Requirements
Depth 24" (unless there is a cooler next to it)
Height 80"