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Fan Curve Corrections

Fan Curve Corrections

Fan Curve Corrections

(OP)
  Need help on theoretical ventilation / fan curves.  Presently running at 3850 feet above sea level with temperatures around 90 degrees F which I believe computes to air density around 0.0624.  This is 20% lower than standard 0.075. Trying to interpret the curves in order to pull something close to the maximum 30HP but I seem to be missing something because the fan is only pulling about 50% of max load.

How does fan power vary  with density???  If  Q  is directly related to density, and HP  relates to the cube of Q,  am I looking at  1.2 cubed as the correction??  Does this sound right??

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