What is the maximum height for fire extinguishers over 40 lbs from the floor?

The correct choice regarding the maximum height for placing fire extinguishers that weigh over 40 lbs is indeed 4½ feet from the floor. This regulation is in accordance with safety standards that ensure fire extinguishers are accessible to individuals in an emergency situation.

Fire extinguishers that exceed 40 lbs are deemed too heavy for certain individuals to easily handle if they're placed too high. Therefore, the limitation to a maximum height of 4½ feet helps ensure that while the extinguishers remain visible and accessible, they do not become impractical for use in urgent situations. This requirement facilitates quick access and helps maintain safety, aligning with the overall goal of effective emergency preparedness within a building.