Fan Sizing

LaRose Web - Online Calculators

Looking to buy some memory cards, usb sticks or other computer accessories, check out My Store


  • Go to LaRose Web
  • Check out other calculators

  • How To Size a Fan

    The horsepower fan can be calculated from the following equations:

  • With pressure in psia, Air hp = 144 * (P2-P1) * Qv / 33,000 = 0.00436(P2-P1)Qv
  • With pressure in in H2O, Air hp = 0.0001575(P2-P1)Qv

    Let's now find the hp for a fan.

    Fan Sizing

    If the flow rate is 0 ft3/min, with a ΔP of 0 psi then the design hp = 0

    If the flow rate is 0 ft3/min, with a ΔP of 0 in H2O then the design hp = 0