Indoor Air sciences CSMI Practice Exam

What is the minimum recommended air changes per hour inside containment according to IICRC S520?

1. 4 ach

2. 12 ach

3. 8 ach

4. 2 ach

The correct answer is: 4 ach

The recommended minimum air changes per hour (ACH) inside containment, as stipulated by the IICRC S520 guidelines, is four. This standard is important because it helps maintain a safe and controlled environment during remediation work, particularly in situations involving mold or water damage. The purpose of achieving this level of air change is to effectively dilute and remove airborne contaminants and ensure that any harmful particles present within the contained area do not escape into the surrounding spaces. The four ACH standard strikes a balance between effectively controlling particulate matter and maintaining energy efficiency, helping to optimize the remediation process while minimizing risks. Higher ACH levels may be recommended for specific circumstances, but the minimum benchmark of four ACH provides a foundational standard for ensuring adequate ventilation and air quality within containment areas.