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Air Scrubber ACH Calculator

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Air Scrubber ACH Calculator

ACH = (airflow CFM × 60) ÷ room volume in ft³. Room volume = floor length × width × ceiling height (all feet).

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What is Air Scrubber ACH Calculator?

Calculates the Air Changes per Hour (ACH) delivered by an air scrubber in a given room or workspace. ACH measures how many times the total air volume in a space is filtered per hour — critical for controlling dust, mold spores, and airborne contaminants during remediation work.

Air Scrubber ACH Calculator Formula / Method

ACH=[Airflow(CFM)×60]/RoomVolume(ft3)ACH = [Airflow (CFM) × 60] / Room Volume (ft^3)
V=Length×Width×HeightV = Length × Width × Height
CFMrequired=(TargetACH×V)/60CFM_required = (Target ACH × V) / 60
Units=ceil(CFMrequired/CFMperunit)Units = ceil(CFM_required / CFM per unit)
EffectiveACH=(CADR×60)/VEffective ACH = (CADR × 60) / V

Air Scrubber ACH Calculator Worked Example

Room: 20×15×9 ft, scrubber: 500 CFM

V=20×15×9=2,700ft3V = 20×15×9 = 2,700 ft^3
ACH=(500×60)/2,700=11.1ACHACH = (500×60)/2,700 = 11.1 ACH

(Above 4 ACH remediation minimum.)

Fortarget6ACHinsameroom:For target 6 ACH in same room:
CFMrequired=(6×2,700)/60=270CFMCFM_required = (6×2,700)/60 = 270 CFM
For5,000ft3at6ACHwith500CFMunit:For 5,000 ft^3 at 6 ACH with 500 CFM unit:
ACH=(500×60)/5,000=6ACH(oneunitmeetstarget).ACH = (500×60)/5,000 = 6 ACH (one unit meets target).

Where Air Scrubber ACH Calculator Is Applied

  • Mold and water-damage remediation planning
  • Asbestos and lead abatement containment
  • Hospital isolation/negative-pressure rooms
  • Construction dust control
  • Pharmaceutical clean-room design
  • Airborne pathogen and smoke filtration planning

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