What qualitative method can indicate adequate airflow at a vent exit?

• A. Use a digital manometer to measure static pressure at the vent.
• B. Observe airflow visually or with a smoke pencil or tissue to confirm movement.
• C. Install a hygrometer to measure humidity at the vent exit.
• D. Use a flux meter to determine airflow.

Answer: (B)

The idea is to use a simple, observable cue to confirm air is moving at the vent exit rather than taking a numeric measurement. A smoke pencil or tissue provides a visible hint of airflow: you can see the smoke plume or the tissue fluttering, showing that air is exiting and roughly how strong it is. If there’s little to no movement, airflow may be inadequate.

Other options give quantitative data rather than a straightforward yes/no about movement. A digital manometer measures static pressure and would require interpretation to infer airflow. A hygrometer checks humidity, which doesn’t indicate how air is moving at the exit. A flux meter measures actual flow rate, which is numeric rather than a simple qualitative check.