How can static pressure readings help locate leaks or blockages in ductwork?

How can static pressure readings help locate leaks or blockages in ductwork?

• A. It indicates that the fan is oversized and delivering too much air.
• B. It indicates a closed loop and no air movement.
• C. Unusually high or changing static pressure along a duct run indicates restrictions, leaks, or damper misadjustments, guiding where to inspect.
• D. It has no diagnostic value.

Answer: (C)