Manually actuated alarm-initiating devices must be mounted between what height from the floor?

The correct choice indicates that manually actuated alarm-initiating devices need to be mounted between 3.5 and 4.5 feet from the floor. This height range is specified to ensure accessibility for individuals of varying heights, including those with disabilities, while ensuring that the devices are not positioned too high or too low where they might be difficult to reach in an emergency. Proper placement of these devices is vital for quick response in emergencies, as manual actuation may be necessary for alerting occupants or activating the fire alarm system.

This height range aligns with the National Fire Protection Association (NFPA) standards and is based on studies of human factors in emergency situations, emphasizing the importance of having alarm systems readily accessible. By adhering to these height recommendations, building owners and managers help to ensure compliance with safety codes and facilitate effective emergency response.