Mouse cages are narrower than rat cages. Most types of modules are available in both widths. Mouse modules are, for the most part, scaled-down versions of the rat modules. Most of the devices on the modules are confined to the space projected rearward by the face dimensions, thus permitting most modules to occupy any position and be adjacent to most other modules. No module, including a retreat box or runway, will interfere with any other module in any hub owing to the radial array of the module bays.
Modules slip into the tracks of the cages and hubs from the top.
Blank module panels are used to space the functional modules to the desired height and to fill the bay. By installing blank panels below modules, they may be adjusted to any desired height from the floor. The bird key, for example, may be placed at 12 different elevations from the floor by using standard blank panels above and below. The Fan-Out also connects the 3 switch input connections in parallel allowing you to use it for shaping. When either of you press, an input reported.