What is the maximum travel distance for manual control operation?

• A. Not more than 4 inches.
• B. Not more than 14 inches (356 mm).
• C. Not more than 6 inches.
• D. Not more than 24 inches.

Answer: (B)

The main idea here is how far an operator has to move the manual release control to activate the system. NFPA 2001 sets a limit on this travel distance to ensure that actuating the manual control can be done quickly and reliably in an emergency. The maximum allowed travel is not more than 14 inches (356 mm). This distance is long enough to allow a firm grip and deliberate action, even with gloves or in a stressful situation, but short enough to prevent delays or awkward reaching that could slow the release. Distances like 4 inches or 6 inches would be overly restrictive for a comfortable pull or lever action, while 24 inches would require a much larger reach and could slow or complicate activation. Therefore, 14 inches is the appropriate limit for manual control operation.