Hand-held fire extinguishers weighing over 40 pounds must be installed with their tops no more than how high from the floor?

Hand-held fire extinguishers weighing over 40 pounds must be installed with their tops no more than 3.5 feet from the floor to ensure they are easily accessible in case of a fire emergency. This height regulation is based on safety considerations, as heavier extinguishers can be difficult to handle, especially during a fire when time and conditions are critical. By keeping them within this height, it allows individuals to quickly respond to a fire without struggling to reach or maneuver a heavy extinguisher. Furthermore, this guideline supports the overall aim of fire safety standards to provide effective emergency response options that can be utilized by the average person, including those who may not be physically strong.

The other height options exceed the recommended limit and could make it challenging for users to access these extinguishers promptly during an emergency, which is contrary to fire safety best practices.