Is the air flowing through the 24" square duct near grid line intersection H5 moving in an upward direction?

The correct answer indicates that the air flowing through the 24" square duct near grid line intersection H5 is not moving in an upward direction. In HVAC systems and duct layout design, the direction of airflow can typically be determined through the schematics or symbols present in the given print.

When evaluating the airflow direction, one would look for ventilation symbols, arrows, or notes indicating airflow path. If such information is absent or suggests a horizontal or downward flow, then it confirms that the air is not moving upwards. In many duct systems, air tends to be either supplied from above or drawn back into a space, aligning more with horizontal or downward flow, particularly in commercial or large residential setups.

Such reasoning helps establish that even with changing environmental conditions, unless it is explicitly marked or specified in the design documents that the airflow is indeed directed upwards, it can be reasonably concluded that the air is not moving in that direction. Thus, determining airflow direction without clear indications typically supports the conclusion that the option signifying that air is not moving upward is the correct interpretation.