The Rhino 10” wide slatted shelves require a ‘gap’ larger than the shelf. For example, a 6ft shelf requires an 8ft ‘gap’ as it fixes to three intermediate glazing bars. You can fit multiple shelves next to each other, however, the total length of the shelves still needs to be less than your greenhouse. For example, two 10”x4’ shelves can be fitted side by side in the 10ft length of your greenhouse.