Residential HVAC Installation Practice Exam

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In HVAC terminology, what does ACH stand for in the formula for cfm calculation?

  1. Airflow Cooling Hierarchy

  2. Airflow Correction Hours

  3. Air Changes per Hour

  4. Airflow Control Handle

The correct answer is: Air Changes per Hour

In HVAC terminology, ACH stands for "Air Changes per Hour" in the formula for cfm calculation. The term refers to the number of times within one hour that the entire volume of air within a space is replaced with fresh air. This is a critical factor in maintaining indoor air quality and ensuring proper ventilation in residential HVAC systems. It is important for HVAC professionals to understand and calculate ACH accurately to ensure proper airflow and ventilation in residential spaces.

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