Step 5 select a size of square duct that has the same area.
Rectangular to round duct calculator.
This can be found by multiplying the two adjacent sides of the rectangular duct.
This online air duct calculator is used to calculate the velocity of air flow feet per minute fpm and feet per second fps through any shaped circle square or rectangle ductulator with either diameter sides or area.
Air duct also termed as ductulator is a passage that is used to provide fresh air into rooms buildings etc air ducts may be in circular square and in rectangular shapes.
Equivalent duct calculator round vs rectangular.
Convert rectangular duct to round equivalent.
Friction loss calculator for sheet metal ducts.
D e 1 30 300 mm 500 mm 0 625 300 mm 500 mm 0 25 420 mm.
In this example the area is 314 square inches.
The table is based on the ducts friction loss formula.
Sheet metal duct friction loss calculator.
Read round duct diameter inches and friction loss per 100 of duct inches of water.
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.
Convert round duct size to rectangular duct size for equivelant airflow.
Enter duct airflow cfm duct velocity fpm duct length and the number of bends.
Include fittings in the duct tel enter either.
Multiply the square of the radius by 3 14 to get the area of the duct in square inches.
The table below can be used to compare equivalent diameters for rectangular and round circular ducts.
Rectangular to equivalent circular duct calculator.
This is a handy tool when deciding what size duct you want to use for your application.
The formula is generic and any unit can be used.
The calculator below is based on formula 1.
Step 5 divide the area from step 4 by 144 to get the area in square feet.
Convert diameter to rectangular equivalent.
I want to calculate.
Indicates required field rectangular width.
Friction loss calculator for flexible ducts.
Converts a rectangular size to the appropriate round size or the available esm flat oval size.
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.
