Air Duct Friction Loss Calculator

Air Duct Friction Loss Calculation

Air Volume Flow

cfm

Equivalent Duct Diameter

Duct Length

Friction Loss

inches water

Friction Loss

inches water per 100 feet

This calculator calculates the friction loss using air volume flow, equivalent duct diameter, duct length values.

Friction Loss = (0.109136 * q^1.9 ) / (d^5.02)
Friction Loss per 100 Feet = (0.109136 * q^1.9 ) / (d^5.02)*(l/100)

Where,
q = Air Volume Flow
d = Equivalent Duct Diameter
l = Duct Length