What Does ACH Stand For?

ACH stands for Air Changes Per Hour

ACH, or Air Changes Per Hour, is a vital metric used to evaluate the ventilation efficiency of indoor spaces. It quantifies the number of times the air within a room or building is replaced with fresh air in one hour. A higher ACH indicates better air circulation and can contribute to improved indoor air quality, making it a key consideration in building design, HVAC system performance, and overall health and safety standards.