Which of the following is true regarding the air grille in Room 003?

The correct assertion regarding the air grille in Room 003 is that it does not supply air from air handler 3. This means that any air being delivered to the room comes from a different source, which helps in understanding the specific configuration and functioning of the building’s HVAC system.

When analyzing the operation of air grilles, it's important to recognize the unique role they play in air distribution. In this case, the distinction is made clear that Room 003 is not using air handler 3, which could be an important detail in diagnosing air quality issues or understanding airflow capacities in different parts of the building.

The other options could be misleading as they provide information about air handlers that may not be relevant to this particular room's setup. For instance, stating that it supplies air from a specific air handler implies a direct connection or dependency that isn’t present in this scenario. Understanding the correct source of airflow is crucial in HVAC systems for proper maintenance and operational effectiveness.