What pointer indicates actual airflow?

• A. Black pointer
• B. Red pointer
• C. White pointer
• D. Blue pointer

Answer: (A)

The gauge is showing multiple signals, but the one that tracks real-time flow is the primary indicator. The black pointer is the actual airflow reading; it responds directly to the moving air in the duct and shifts as the true flow changes. The other pointers are typically used for reference values or setpoints (like a target flow or an auxiliary measurement), but they don’t reflect the instantaneous airflow the way the black pointer does. So when you’re assessing how much air is moving, look at the black pointer—the real-time airflow.