Air Changes Per Hour (ACH) Calculator

ACH Calculation Formula

\[ ACH = \frac{CFM \times 60}{\text{Area} \times \text{Height}} \]

Where:

• \( ACH \) = Air changes per hour
• \( CFM \) = Cubic feet per minute of air flow
• \( \text{Area} \) = Area of the room (square feet)
• \( \text{Height} \) = Height of the room (feet)