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Air Changes (ACH) Calculator

ACH plus the ASHRAE 62.2 ventilation target.

Inputs

Inputs and assumptions

Measured or designed outdoor-air CFM.

Space length.

Space width.

Ceiling height.

People regularly in the space.

Result

Air changes per hour
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ASHRAE 62.2 target (CFM)
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What to check

  • Ventilation CFM
  • Occupant count

Related calculators

Screening estimate only. Verify nameplate ratings, measurements, and installer quotes before making a decision.

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