Hourly Air Exchange Calculator: Measure Air Changes Per Hour
Calculate air changes per hour (ACH) in any room by entering dimensions and ventilation rate. Essential for assessing indoor air quality and ventilation effectiveness.
Hourly Air Exchange Calculator
Room Information
Room Dimensions
ft
ft
ft
Ventilation Information
CFM
Results
Room Volume
0.00 ft³
Air Changes per Hour (ACH)
0.00 ACH
Air Quality: Poor
Calculation Formula
ACH = (Ventilation Rate × 60) ÷ Room Volume
0.00 = (100 CFM × 60) ÷ 0.00 ft³
Recommendations
The air exchange rate is very low. Consider increasing ventilation to improve indoor air quality.
Room Air Exchange Visualization
The visualization shows air flow patterns based on the calculated air changes per hour (ACH).
About Air Changes per Hour (ACH)
Air Changes per Hour (ACH) measures how many times the air volume in a space is replaced with fresh air every hour. It's a key indicator of ventilation effectiveness and indoor air quality.
Recommended ACH Values by Space Type
- Residential spaces: 0.35-1 ACH (minimum), 3-6 ACH (recommended)
- Office buildings: 4-6 ACH
- Hospitals and healthcare facilities: 6-12 ACH
- Industrial spaces: 4-10 ACH (varies by activity)
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Documentation
Hourly Air Exchange Calculator
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