Friction loss calculator for sheet metal ducts.
Square duct to round duct calculator.
Add for right seam.
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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New duct sizing chart xls.
I want to calculate.
1 of 2 identical pieces like a clam.
The rectangular dimensions and the air flow volume are adapted to the equal friction loss.
Add for left seam.
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The table below can be used to compare equivalent diameters for rectangular and round circular ducts.
To then convert that to volume you multiply the resulting area by the length.
This is a handy tool when deciding what size duct you want to use for your application.
Friction loss calculator for flexible ducts.
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Enter duct airflow cfm duct velocity fpm duct length and the number of bends.
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.
Round use a slightly smaller diameter for less crimping or to finish the top with an added round collar lower.
Convert round duct size to rectangular duct size for equivelant airflow.
Duct areas in square feet can be calculated by using geometry rules for round areas.
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 table is based on the ducts friction loss formula.
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Remember to add if bending the lower scrape in or out upper diameter.
It is particularly handy to provide the area in square feet of round duct as well.
The area will cover a two dimensional slice of the duct.
Rectangular to round conversion.
Read round duct diameter inches and friction loss per 100 of duct inches of water.
Square to round calculator.
Sheet metal duct friction loss calculator.
Step 5 select a size of square duct that has the same area.
Equivalent duct calculator round vs rectangular.
