For doors with re-opening devices, the maximum allowable kinetic closing force is how many foot-pounds?

The correct value for the maximum allowable kinetic closing force for doors with re-opening devices is 7 foot-pounds. This specification is essential for ensuring safety in elevator operation, as it minimizes the risk of injury to individuals who may inadvertently come into contact with the closing door.

Setting the maximum kinetic closing force at this level helps in adhering to safety standards that aim to protect passengers from being accidentally trapped or struck by the moving door. This threshold is particularly important in facilities that accommodate various users, including those with mobility challenges.

In contrast, lower values would not provide enough leeway for the operational mechanics while maintaining safety, while a higher value could pose unnecessary risks of injury or discomfort during door operation. The 7 foot-pounds benchmark effectively balances the need for efficient operation while prioritizing user safety in elevator systems.