What would you typically find as the primary purpose of a spreader board in elevator doors?

The primary purpose of a spreader board in elevator doors is to maintain door frame stability. This component is crucial because it helps support the structure of the door frame, ensuring that it remains aligned and secure during operation. By providing this support, the spreader board contributes to reliable door function and safety.

In elevator systems, door frames need to withstand various forces during opening and closing, as well as any potential impacts. A stable door frame minimizes the risk of misalignment and enhances the overall durability of the elevator doors, which is vital for passenger safety and system performance.

The other options, while they may relate to aspects of elevator systems, do not encapsulate the primary function of a spreader board. This distinction reinforces the importance of understanding the components' roles in maintaining both the functionality and safety of elevator installations.