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What diameter should the fabric duct be? Is there a minimum/maximum?

April 26, 2017diameter duct fabric maximum minimum

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What diameter should the fabric duct be? Is there a minimum/maximum?

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On a general note KE Fibertec offers diameters from 8 64, but diameters outside of this range have been done for custom applications. The volume of air supplied to the duct will determine the diameter, recommended is design around 1500 fpm inlet velocity to reduce the risk of the duct fluttering and uneven air distribution (entrainment). The higher the inlet velocity (above 1500fpm) the more static pressure will be required to counter the increased turbulence.