Air changes per hour (ACH) is a crucial metric used to quantify the ventilation rate of a space. It represents how many times the air within a defined area is replaced in a single hour. For instance, an ACH of 6 indicates a complete air exchange six times every hour. The calculation involves factors such as the airflow rate, measured in cubic feet per minute (CFM), and the volume of the space.
Maintaining adequate ventilation rates is essential for various applications, impacting indoor air quality, thermal comfort, and energy efficiency. Historically, ventilation was primarily achieved through natural means like open windows. Modern building designs often incorporate mechanical ventilation systems, requiring precise calculations to ensure optimal performance and compliance with building codes and standards. Proper ventilation dilutes indoor pollutants, regulates temperature and humidity, and contributes to a healthier indoor environment.
