Backdraft Calculator

Note: Calculator is designed specifically for the Tornado range of ventilators. The superior design of the Tornado dome (rotor) will enhance the extraction capacity up to 50% compared to similar designed products. The result of the calculator cannot be compared to other products and may have a negative impact on the effectiveness of the ventilation requirements of the application (refer to sketch)

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Tornado-Superior Features

Step 1

Calculate the volume of the building.

Total volume:   m3

Step 2

Determine the rate of air flow required for your specific application.
The rate of air flow is measured in air changes per hour.
Air changes per hour is the volume of air that needs to be replaced with fresh air every hour.
e.g. Factories and Workshops = 15 air changes required.

Step 3

Multiply the volume (step 1) by the number of air changes required (step 2).

Volume:   m3

Step 4

Determine the size and quantity of Tornado turbine ventilators required for the above application.
Total volume of air (step 3) divided by the extraction capacity of the specific Tornado Turbine.