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Recent content by Leon95628

  1. Leon95628

    Derivation of air flow constant 4005?

    Thanks very much!!
  2. Leon95628

    Derivation of air flow constant 4005?

    I am looking for a derivation of the constant "4005" that is used in hvac vav's for air flow vs. velocity pressure in a round pipe. Q(cfm) = 4005 * aspect ratio * sqrt [velocity pressure (in h20)] Thanks!!
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