Obstruction Height refers to the height of obstruction affecting sprinkler placement.

• A. Height of obstruction affecting sprinkler placement
• B. Height of ceiling
• C. Height of sprinkler head
• D. Height of room

Answer: (A)

In sprinkler design, you must account for anything that sits in or into the spray path and could block or alter the discharge. The height you’re concerned with is the vertical dimension of that obstructing object—how high it sits above the floor or above the sprinkler’s spray zone. That height is used to judge whether the water can reach the intended area or if adjustments are needed in sprinkler placement or spray patterns.

So why this option fits best: it defines obstruction height as the height of an obstruction affecting sprinkler placement. The height of the ceiling, the height of the sprinkler head, or the overall room height aren’t what’s being described here; they describe other dimensions that don’t specifically capture how a hanging or protruding object could interfere with the sprinkler’s discharge.