What is the maximum mounting height for the topmost operable button on an ADA-compliant alarm keypad (from floor to button)?

• A. No more than 60 inches from the floor to the topmost operable button
• B. No more than 72 inches from the floor to the topmost operable button
• C. No more than 36 inches from the floor to the topmost operable button
• D. No more than 48 inches from the floor to the topmost operable button

Answer: (D)

Accessibility requires that alarm keypad controls be usable by people in wheelchairs, so the topmost operable button must be mounted at a height within reach. The ADA sets a practical maximum height for the top of an operable control to ensure someone seated can press it without strain, and for a keypad this limit is 48 inches from the finished floor. That’s why the best choice is the one that specifies no more than 48 inches. Heights higher than this would be inaccessible to some users and not compliant, while a lower height remains accessible but does not reflect the maximum allowed height.