Tunnel ventilation — cfm sizing.
Compute peak tunnel-ventilation cfm from house cross-section and target air speed, plus indicative fan count for typical 48-inch 25,000 cfm fans.
Inputs
Results
- Cross-section
- 36.4 m²
- Tunnel airflow
- 91.0 m³/s
- Peak airflow required
- 192,818 cfm
- 48-inch fans (at working pressure)
- 10
- Engineering confirmation
- Required
Width × sidewall height — a simplified rectangle, not a surveyed section.
193k cfm
Sized on 21,250 cfm/fan at ~25 Pa. Free-air catalogue sizing would show only 8 fans and under-ventilate the house.
Final fan count, inlet area and static-pressure design must come from a ventilation engineer using the actual fan curves.
Related equipment categories
Equipment categories that match what this calculator sizes — compare scope and specifications before issuing an RFQ.
In short
This ventilation calculator is a free browser tool for commercial poultry projects. Enter your own figures and it returns a class-4 planning estimate (about ±30%) under conservative, expected and optimistic scenarios. Use it to size an investment and to brief manufacturers — a firm supplier quote always overrides the estimate.
How to use this calculator
- Enter your project figures. Replace the default values in the ventilation calculator with your own flock size, targets and local costs. Defaults are commercial-sector averages, not a recommendation.
- Compare the three scenarios. Switch between conservative, expected and optimistic to see how sensitive the result is to your assumptions before committing capital.
- Read the assumptions. Check the assumptions panel so you know what the model excludes — typically taxes, import duties, special civil works and land.
- Turn the output into a quote request. Send the resulting figures in a single request to receive comparable offers from qualified third-party manufacturers.