Air duct calculator

so, you want to play HVAC engineer do ya? Well, try this handy air duct calculator:

http://efficientcomfort.net/jsp/DuctCalculator_Web.jsp

uses: diameter, velocity, duct type, rate of friction loss, cfm, duct material (PVC/Alum. Sheet Metal Fibrous Flexible), roughness, length, rectangluar to round to flat oval equivalent, ovaled round

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