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Enter flow rate (CFM) and duct diameter (inch) to begin sizing
QUICK-GUIDE
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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)
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Enter the air flowrate in cubic feet per minute (CFM)
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Enter an internal duct size in inches (this must be limited to a maximum aspect ratio of 5:1 for the results to be valid)
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The resulting velocity and pressure drop per unit length are displayed in the blue box.
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