If an IAQ professional is retained for the project, they will calculate the number of air exchanges per hour based on the type of project (mold remediation, dust control, fire restoration, etc.). From our experience, for dust control purposes, such as a construction project, 2–4 air exchanges per hour are normally sufficient. On mold remediation projects, 4 air exchanges per hour is common. Some indoor environmental professionals, such as industrial hygienists, may suggest 6–12 air exchanges per hour for mold remediation and similar projects.
