Indicates required field rectangular width.
Rectangular to round duct calculator.
The calculator below is based on formula 1.
Enter duct airflow cfm duct velocity fpm duct length and the number of bends.
Sheet metal duct friction loss calculator.
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.
The table below can be used to compare equivalent diameters for rectangular and round circular ducts.
Convert diameter to rectangular equivalent.
This is a handy tool when deciding what size duct you want to use for your application.
Convert round duct size to rectangular duct size for equivelant airflow.
The formula is generic and any unit can be used.
I want to calculate.
Convert rectangular duct to round equivalent.
Multiply the square of the radius by 3 14 to get the area of the duct in square inches.
The equivalent diameter of a 300 mm x 500 mm rectangular duct can be calculated as.
Step 5 select a size of square duct that has the same area.
Converts a rectangular size to the appropriate round size or the available esm flat oval size.
This can be found by multiplying the two adjacent sides of the rectangular duct.
In this example the area is 314 square inches.
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.
Rectangular to equivalent circular duct calculator.
Equivalent duct calculator round vs rectangular.
Friction loss calculator for flexible ducts.
Step 5 divide the area from step 4 by 144 to get the area in square feet.
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.
Read round duct diameter inches and friction loss per 100 of duct inches of water.
The table is based on the ducts friction loss formula.
Include fittings in the duct tel enter either.
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.