Overhead is the measurement from the top floor to the top of the elevator hoistway known as overhead space. This space allows the elevator to travel to the top floor with enough space for the equipment on top of the elevator. The overhead requirements are subject to the type of equipment, cab, door heights, and speed. The minimum is 96”, 108”, 112”, 120” and 134” are based on taller elevators, doors, etc. 120” is very common for homes with 8’ doors. 112” is common for homes with 7’ doors.