Which statement describes the effect of increasing external static pressure on a ducted system?

Which statement describes the effect of increasing external static pressure on a ducted system?

• A. Increasing external static pressure improves airflow.
• B. Increases in external static pressure reduce airflow and can degrade performance and energy use.
• C. External static pressure only affects indoor humidity.
• D. External static pressure has no effect on modern variable-speed fans.

Answer: (B)