Flexible Duct Calculator

Based on Friction loss

Friction Loss			Inches H2O

Air Flow			CFM

Length			Feet

90^o Bends			Quantity

45^o Bends			Quantity

180^o Bends			Quantity

Duct Diameter			Inches

Duct Velocity			FPM

Based on Duct Diameter

Diameter			Inches

Air Flow			CFM

Length			Feet

90^o Bends			Quantity

45^o Bends			Quantity

180^o Bends			Quantity

Friction Loss

Duct Velocity			FPM

Equivalent Rectangular Duct

Round Duct Diameter			Inches

Rectangular Duct Length			Inches

Rectangular Duct Width			Inches

Equivalent Round Duct Diameter

Rectangular Duct Length			Inches

Rectangular Duct Width			Inches

Round Duct Diameter			Inches