ICC Commercial Mechanical Practice Exam

Question: 1 / 400

What does the term 'air change rate' indicate?

The frequency of air filtration in the HVAC system

The volume of air supplied to the system

The number of times the air in a space is replaced with fresh air in an hour

The term 'air change rate' refers to the number of times the air within a defined space is replaced with fresh air over the course of one hour. This measure is crucial in assessing indoor air quality and ensuring proper ventilation in environments such as commercial buildings, hospitals, and schools. A higher air change rate generally contributes to a healthier indoor environment by reducing the concentration of airborne contaminants and ensuring adequate oxygen levels for occupants.

Understanding air change rates is important for HVAC system design and efficiency, as it helps engineers determine the necessary airflow to maintain appropriate indoor conditions. Factors like room size, occupancy, activity level, and the presence of contaminants all influence the required air change rate for a given space.

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The amount of air transferred between rooms

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