How many air exchanges per hour are required for proper air filtration?

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.

Bill Weigand, Director of Restoration Chemicals for Legend Brands, has over 35 years of experience in the restoration industry. He has worked on disaster restoration projects in the United States, Canada and the Caribbean, and now teaches IICRC-certified smoke and water damage restoration courses for Legend Brands across North America.