Calculate how many air scrubbers or negative air machines you need based on room size and application. Our calculator uses IICRC S520 mold remediation standards and EPA guidelines for air changes per hour (ACH).
Enter the length, width, and ceiling height of your containment area
Select the primary use case - this determines required air changes per hour (ACH)
How severe is the contamination or dust level?
Air Scrubber Sizing Guide
Understanding ACH
Air Changes per Hour (ACH) = how many times the entire room volume is filtered each hour. Higher ACH = faster air cleaning and better containment.
Negative Pressure
For abatement work, air scrubbers create negative pressure by exhausting filtered air outside the containment, preventing contaminated air from escaping.
HEPA Filtration
True HEPA filters capture 99.97% of particles at 0.3 microns — including mold spores, asbestos fibers, and lead dust particles.
Multiple Units
For large spaces, multiple smaller units provide better air distribution than one large unit. Position units to create airflow across the entire space.
How We Calculate
CFM Required = (Room Volume × ACH) ÷ 60
Room Volume = Length × Width × Height (cubic feet)
ACH varies by application: Mold (6 ACH), Asbestos (4 ACH), Construction (8 ACH), General (3 ACH)
Need Help Sizing Your Project?
Our team has real restoration and abatement experience. Call us for personalized recommendations.