As per image above one has to be aware of 3 important factors to build gondola shelving units;
1- Gondola Units width are available in 4 fixed sizes;
665mm – 800mm – 1000mm – 1250mm.
2- In terms of the height they start from 1.1m. to a height of 2.1m. Can be cut to any height necessary.
3- Also, the shelf depth are available in the following sizes; 250mm, 300mm, 370mm, 470mm & 570mm.
Taking into account the above mentioned widths of Units in (1), you can fix any combination together to suit the wall length needed.
For example a wall which measures 3.7m means that you can join 3 off the 1000mm Units together with a 665mm to fit into that wall.
Below is a table for the most popular Gondola unit sizes (which can be joined together in any length combination as per example above):