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Nate Formulas
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Nate Formulas Fan law: Pulley size Formula - answerDPm X RPMm = DPf X RPMf DP=Diameter of Pulley f=Fan or Driven m=Motor or Driver Actual Brake HP of a motor - answerBHP = HPnp( Amps/FLA) np = Name plate Synchronizes speed of a motor - answer7200 / # of poles Convert Velocity pressure (Vp) i...

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  • October 1, 2024
  • 3
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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Nate Formulas


Fan law: Pulley size Formula - answer✔DPm X RPMm = DPf X RPMf


DP=Diameter of Pulley f=Fan or Driven
m=Motor or Driver

Actual Brake HP of a motor - answer✔BHP = HPnp( Amps/FLA)


np = Name plate

Synchronizes speed of a motor - answer✔7200 / # of poles

Convert Velocity pressure (Vp) into Feet Per Minute (FPM) - answer✔FPM = 4005(sqrt of Vp)

Convert V(velocity) into CFM - answer✔CFM = Asqft X Vfpm


Asqft = Area of the ductwork in square feet


Vfpm = Velocity in Feet Per Minute

Tp(total pressure) equals - answer✔Tp = Static (Sp) + Velocity (Vp)

The formula to figure the BTUH of an ac system using field measurements - answer✔BTUH =
4.5(CFM) x (Delta Enthalpy)

Fan law: Basic fan law formula - answer✔BHP2 = BHP1 X ((RPM2 / RPM1)cubed)
Shows that required power of a motor varies by the Cube of the speed increase of that motor.

The formula to figure the CFM of a Gas furnace using field measurements. - answer✔CFM =
BTUH(output) / 1.08 X Delta T

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