The equivalent diameter is the diameter of a circular duct or pipe that gives the same pressure loss as an equivalent rectangular duct or pipe.
Square to round duct transition calculator.
This opened the door for the use of sheet metal for ducting.
Friction loss calculator for flexible ducts.
Equivalent duct calculator round vs rectangular.
I want to calculate.
Transition elbow offset box wedge.
The table below can be used to compare equivalent diameters for rectangular and round circular ducts.
For example if you found a duct that measured 10 inches by 5 inches its area would also be 50 square inches.
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Converting a rectangle to round sheet metal duct work is something that is common in hvac.
Round use a slightly smaller diameter for less crimping or to finish.
The rectangular dimensions and the air flow volume are adapted to the equal friction loss.
For example our original 8 inch round duct should be mated to the 10 inch by 5 inch rectangular duct.
Remember to add if bending the lower scrape in or out upper diameter.
With some careful planning this is something you can do yourself.
Rectangle square to round transition.
Step 6 select an adapter that will convert between the round and the square duct sizes from your local building supply center.
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Step 1 use a square or rectangle to round transition calculator.