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