NATE Air Conditioning and Heat Pumps Practice Exam

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Which of the following is measured to determine the total resistance to air flow in a ductwork system?

  1. Current draw of the compressor motor

  2. External static pressure at the air handler or furnace

  3. Power input to the electric heater

  4. Temperature rise across the electric heater

The correct answer is: External static pressure at the air handler or furnace

Determining the total resistance to air flow in a ductwork system is primarily achieved by measuring the external static pressure at the air handler or furnace. This measurement reflects the pressure available to push air through the various components of the duct system, including any bends, filters, and registers. Static pressure is a crucial indicator of airflow efficiency; high resistance can result from restrictive components which may lead to reduced airflow and increased energy costs. By measuring the external static pressure, technicians can evaluate how well the system is performing and identify any issues that may be causing excessive resistance. This data is essential for ensuring that the HVAC system operates efficiently and effectively, maintaining proper air circulation throughout the space served.

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