what Is Air Changes Per Hour (ACH)?

August 19, 2023 | My HVAC Price

Air Changes per Hour (ACH) is a quantitative measure used to describe the rate at which the entire volume of air within a specific space is replaced with fresh outdoor air over the course of one hour.

A higher ACH value signifies a more frequent turnover of indoor air, indicating enhanced ventilation and potential improvements in indoor air quality. ACH is an important metric in assessing the effectiveness of ventilation systems, particularly in environments where maintaining proper air quality is crucial.

People Also Ask About ACH

Why is ACH important for indoor environments?

ACH is important because it provides insights into how effectively a space is being ventilated. Higher ACH values mean more frequent air exchanges, which can reduce indoor pollutants, allergens, odors, and humidity, contributing to a healthier and more comfortable indoor environment.

How is ACH calculated?

ACH is calculated by dividing the airflow rate (in cubic feet per minute) by the volume of the space (in cubic feet). The resulting value indicates how many times the entire air volume is replaced with fresh air in one hour.

Can ACH be improved in existing buildings?

Yes, ACH can often be improved in existing buildings by optimizing ventilation systems, adjusting airflow rates, and enhancing air distribution. However, balancing increased ventilation with energy efficiency considerations is essential, and consulting HVAC professionals can help find the right approach for each space.

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