To work with Air casters 2 main things are important. Sufficient compressed air must be available. In addition, the floor must be flat and airtight so that the cushion can settle against the floor before an air film is created. Sometimes there are small cracks or joints in the floor, so that the air film is not retained with a normal Air caster. This can make further movement very difficult. Because the Aerofilm gap crosser distributes the air discharge over several holes, small cracks, crevices and joints can easily be overcome.