What is the primary purpose of measuring air pressure in ductwork?

Measuring air pressure in ductwork is primarily done to assess system efficiency. Air pressure measurements provide critical information about how well the HVAC system is performing. When the air pressure is within the designed specifications, it indicates that the system can deliver the intended airflow throughout the building. If the air pressure is too high or too low, it may signify issues, such as blockages, leaks, or improper balancing, which could reduce energy efficiency and comfort levels.

Evaluating system efficiency through air pressure measurements helps identify problems that can lead to increased operational costs and lower indoor air quality. Efficient airflow typically correlates with a well-maintained system, ensuring that heating and cooling are delivered effectively to the occupied spaces.

While the other options might have some relevance to the overall operation of an HVAC system, they do not directly relate to the primary function of measuring air pressure in ductwork. Calculating duct length focuses more on design rather than performance, determining filter effectiveness involves separate testing, and evaluating duct materials pertains to construction rather than ongoing performance efficiency.