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Calculator guide

Ventilation calculator: full guide

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.

Open the calculator

How to use this calculator

  1. 1

    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.

  2. 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. 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. 4

    Turn the output into a quote request

    Send the resulting figures in a single request to receive comparable offers from verified 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
  • Airflow91.0 m³/s
  • Peak cfm required192818 cfm
  • 48-inch fans (25k cfm)8

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
  • Airflow156.0 m³/s
  • Peak cfm required330545 cfm
  • 48-inch fans (25k cfm)14

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
  • Airflow91.0 m³/s
  • Peak cfm required221741 cfm
  • 48-inch fans (25k cfm)9

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.

Frequently asked questions

How accurate is the ventilation calculator?
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.
Can I use these results to request manufacturer offers?
Yes, that is the intended use. Turn the results into a requirement list and send a single request to receive comparable offers from verified manufacturers. Any firm quote overrides the estimate.
Do results change with the project country?
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.
Do I need the guide or the ventilation calculator itself?
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.
What should I do with the result?
Convert it into a requirement list and send one request for quotation. You receive comparable offers from verified manufacturers, and each firm quote replaces the estimate.

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