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Air Duct Calculator

Flexible Duct Friction Loss Calculator

1. Enter Friction Loss Per 100' of duct (inches of water), Duct Airflow (CFM), Duct Length and the number of bends.

2. Read Duct Diameter (inches) and Duct Velocity (FPM).

Friction Loss
(inchess water):
Duct Airflow
(CFM):
Duct Length
(feet):
90 Bends
(quantity):
45 Bends
(quantity):
180 Bends
(quantity):
Duct Diameter
(inches):
Duct Velocity
(FPM):

1. Enter Round Duct Diameter (inches), Duct Airflow (CFM), Duct Length and the number of bends.

2. Read Friction Loss Per 100' of duct (inches of water) and Duct Velocity (FPM).

Duct Diameter
(water):
Duct Airflow
(CFM):
Duct Length
(feet):
90 Bends
(quantity):
45 Bends
(quantity):
180 Bends
(quantity):
Friction Loss
(inchess water):
Duct Velocity
(FPM):

Sheet Metal Duct Friction Loss Calculator

1. Enter Duct Airflow (CFM), Duct Velocity (FPM), Duct Length and the number of bends.

2. Read Round Duct Diameter (inches) and Friction Loss Per 100' of duct (inches of water).

Duct Velocity
(FPM):
Duct Airflow
(CFM):
Duct Length
(feet):
90 Bends
(quantity):
45 Bends
(quantity):
180 Bends
(quantity):
Duct Diameter
(inches):
Friction Loss
(inchess water):

1. Enter Friction Loss Per 100' of duct (inches of water), Duct Airflow (CFM), Duct Length and the number of bends.

2. Read Duct Diameter (inches) and Duct Velocity (FPM).

Friction Loss
(inchess water):
Duct Airflow
(CFM):
Duct Length
(feet):
90 Bends
(quantity):
45 Bends
(quantity):
180 Bends
(quantity):
Duct Diameter
(inches):
Duct Velocity
(FPM):

1. Enter Round Duct Diameter (inches), Duct Airflow (CFM), Duct Length and the number of bends.

2. Read Friction Loss Per 100' of duct (inches of water) and Duct Velocity (FPM).

Duct Diameter
(inches):
Duct Airflow
(CFM):
Duct Length
(feet):
90 Bends
(quantity):
45 Bends
(quantity):
180 Bends
(quantity):
Friction Loss
(inchess water):
Duct Velocity
(FPM):

Equivlent Rectangular Duct

1. Enter Round Duct Diameter.

2. Enter the Desired Length of the Rectangular Duct.

Rd Duct Diameter
(inches):
Rect. Duct Length
(inches):
Rect. Duct Width
(inches):

Equivlent Round Duct Diameter

1. Enter the Length of the Rectangular Duct.

2. Enter the Width of the Rectangular Duct.

Rect. Duct Length
(inches):
Rect. Duct Width
(inches):
Rd. Duct Diameter
(inches):