What type of door mechanism is commonly required in service and hospital elevators for wider entrances?

In service and hospital elevators, the two-speed sliding door mechanism is commonly required for wider entrances. This type of door allows for efficient and quick access, which is essential in environments where time is a critical factor, such as medical facilities where patients may be transported quickly on stretchers or wheelchairs.

The two-speed sliding mechanism offers larger openings that can accommodate the movement of these larger or bulkier items, facilitating smoother entry and exit. By operating at two speeds, the doors can open quickly when necessary but also provide a slower opening option that can enhance safety and comfort for passengers. This combination is ideal for accommodating high traffic volumes while ensuring efficient operation in a variety of scenarios.

The other door mechanisms either do not provide the same level of accessibility needed for wider entrances or are less suitable for the demands of hospital environments.