The table below can be used to compare equivalent diameters for rectangular and round circular ducts.
Square duct to round duct calculator.
Multiply this number by 3 14 pi to get the area of the round duct in square inches for example 16 x 3 14 50 24 square inches.
Remember to add if bending the lower scrape in or out upper diameter.
Add for left seam.
The rectangular dimensions and the air flow volume are adapted to the equal friction loss.
This calculator can be used to calculate the area in square feet when the height inches and width inches of rectangular duct is known.
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.
The area will cover a two dimensional slice of the duct.
To then convert that to volume you multiply the resulting area by the length.
1 of 2 identical pieces like a clam.
If you need more information or help please contact.
It is particularly handy to provide the area in square feet of round duct as well.
New duct sizing chart xls.
This is a handy tool when deciding what size duct you want to use for your application.
Other hart cooley mobile tools.
I want to calculate.
Square to round calculator.
Equivalent duct calculator round vs rectangular.
Enter duct airflow cfm duct velocity fpm duct length and the number of bends.
Convert round duct size to rectangular duct size for equivelant airflow.
Add for right seam.
Duct areas in square feet can be calculated by using geometry rules for round areas.
Sheet metal duct friction loss calculator.
Round use a slightly smaller diameter for less crimping or to finish the top with an added round collar lower.
Friction loss calculator for flexible ducts.
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Wide x deep lower scrape.
Flex duct 05 on most metal duct calculator round metal pipe 06 on most metal duct calculators field duct sizing chart rectangular sheet metal duct 07 on most metal duct calculators.
Read round duct diameter inches and friction loss per 100 of duct inches of water.
Flexible duct round metal pipe 750 1200 14 16 design airflow 50 85 125 1500 2000 180 240 325 525.
Friction loss calculator for sheet metal ducts.
