Air Scrubber Calculator

Size HEPA air scrubbers for restoration by calculating required CFM and unit count based on room volume and air changes.

Room Volume (cu ft)

Target Air Changes/Hour

Filter Type

Tab to move between fields

CFM Required

400 CFM

Air Scrubbers Needed

Filter Life31.3 days

How to Use This Calculator

Enter the room volume (cu ft) (length x width x height) for the work area.
Set the target air changes per hour (ACPH) -- IICRC S520 recommends >=4 ACPH for mold work.
Review required CFM, number of units needed, and daily kWh consumption.
Check filter life (days) to plan filter changeout schedules and consumables budget.
Verify negative pressure is achievable with the selected units before starting containment work.

How the result changes with Room Volume (cu ft)

Room Volume (cu ft): Total volume of the space (sqft × ceiling height)
Target Air Changes/Hour: Desired air changes per hour — 4 ACH for maintenance, 6+ for active remediation
Filter Type: 1 = HEPA (particles), 2 = Carbon (VOCs/odor), 3 = Combo HEPA + carbon

Identify Input Parameters
Room Volume (cu ft) = 4000, Target Air Changes/Hour = 6, Filter Type = 1 = 3 input(s) provided
Calculate CFM Required
CFM Required
400 = 400
Calculate Air Scrubbers Needed
Air Scrubbers Needed
1 = 1

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