How many return jambs do center-opening doors have?

Center-opening doors typically have two return jambs. Each side of the door has its own return jamb that supports the vertical edges of the door frames, providing stability and guiding the doors as they slide open and closed. This design allows for efficient use of space and a seamless opening, making it easier for passengers to enter and exit the elevator.

Each return jamb plays a crucial role in the overall functionality and safety of the elevator door system, ensuring that the doors align correctly and operate smoothly. For center-opening configurations, having two return jambs accommodates the mechanism that allows both doors to slide neatly to the sides, creating an unobstructed entryway.