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Fan Affinity: Same Fan
Fan Affinity = Pump Affinity

Scaling Law: Geometrically Similar
Fan Scaling = Pump Scaling

Static Head
hs = ha

Static Head when given suction and discharge

Velocity Head

Velocity Head if given suction and discharge

Total Head
H = hs + hv
Air Power

Fan Efficiency

Static Power

Static Efficiency

Fan and Static Efficiency Relation

Density of Water and Air: SI and Eng Table

Velocity Head of Water Gauge:
hv = [v² / 2g] * (pa/pw)