Horizontal channels attach to standard end frames so you may create your own custom modules. Horizontal channels come in the following widths:
17″ (for 24″ od. module)
23″ (for 30″ od. module)
29″ (for 36″ od. module)
41″ (for 48″ od. module)
32.5″ (two for 72″ od. module)