QUESTIONS & COMMENTS
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Select the duct material from the drop-down list (most duct sizing tools are typically based on galvanised steel ducting by default)
Enter the air flowrate in litres/second (can change to cubic metres/second by use of drop-down to the right of the input)
Enter an internal duct size (this must be limited to a maximum aspect ratio of 5:1 for the results to be valid)
The resulting velocity and pressure drop per unit length are displayed in the blue box.