Residential HVAC Installation Practice Exam

Question: 1 / 400

What would be the impact on cfm if the ACH (Air Changes per Hour) value is increased in an HVAC system?

Decrease in air volume

Increase in air volume

Increasing the ACH (Air Changes per Hour) value in an HVAC system would lead to an increase in air volume. This is because a higher ACH value means that the air in the space is being replaced more frequently, resulting in a greater volume of air being moved through the system. This increase in air volume helps improve ventilation and air quality by reducing the concentration of contaminants in the indoor air. Therefore, the correct answer is B.

The other options are not correct because increasing the ACH value would not result in a decrease in air volume (option A), have no impact on air volume (option C), or directly lead to improved air quality (option D).

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No impact on air volume

Improved air quality

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