This guide explains what the ventilation calculator computes, how each input changes the result, and how to turn the output into a comparable request for quotation. Worked examples below are produced with the same engine that powers the live tool.
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.
2
Compare the three scenarios
Switch between conservative, expected and optimistic to see how sensitive the result is to your assumptions before committing capital.
3
Read the assumptions
Check the assumptions panel so you know what the model excludes — typically taxes, import duties, special civil works and land.
4
Turn the output into a quote request
Send the resulting figures in a single request to receive comparable offers from qualified third-party manufacturers.
Every input explained
Default values are commercial-sector averages. Replace them with your own figures — your data always overrides the defaults.
House width (m)
14
Sidewall height (m)
2.6
Target air speed (m/s)
2.0 m/s temperate; 2.5-3.0 hot climates. — 2.5
Worked examples
Three realistic cases, computed live with the calculator engine.
Baseline case
Reference values under the expected scenario — a good starting point for a first project.
Inputs
House width14 m
Sidewall height2.6 m
Target air speed2.5 m/s
Results
Cross-section36.4 m²
Tunnel airflow91.0 m³/s
Peak airflow required192,818 cfm
48-inch fans (at working pressure)10
Scale-up case
The same project with flock size increased 2.5×, to show how the result scales.
Inputs
House width24 m
Sidewall height2.6 m
Target air speed2.5 m/s
Results
Cross-section62.4 m²
Tunnel airflow156.0 m³/s
Peak airflow required330,545 cfm
48-inch fans (at working pressure)16
Conservative case
Reference values under the conservative scenario, with a safety margin on performance.
Inputs
House width14 m
Sidewall height2.6 m
Target air speed2.5 m/s
Results
Cross-section36.4 m²
Tunnel airflow91.0 m³/s
Peak airflow required221,741 cfm
48-inch fans (at working pressure)11
Planning assumptions
The ventilation calculator uses common commercial-sector parameters; your own measured data always overrides the defaults.
The conservative scenario adds a safety margin; the optimistic scenario assumes favourable operating conditions.
Taxes, import duties, special civil works and land cost are excluded unless stated otherwise.
It is a class-4 planning estimate (roughly ±30%). Use it to compare options, size an investment and prepare a quotation request — it does not replace engineering design or a bankable feasibility study.
Yes, that is the intended use. Turn the results into a requirement list and send a single request to receive comparable offers from qualified third-party manufacturers. Any firm quote overrides the estimate.
Yes. Climate, grid voltage and stability, labour cost, import duties and logistics all move both the sizing and the cost. State the country in your request so the adjustment is priced into the offer.
Use the guide to understand the inputs and see worked examples, then run the calculator with your own figures. Both pages are free and require no registration.
Convert it into a requirement list and send one request for quotation. You receive comparable offers from qualified third-party manufacturers, and each firm quote replaces the estimate.
