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. Enter duct dimensions for rectangular, round or flat oval, and duct surface area is automatically calculated. Measure the distance across the duct , in inches, then multiply by 3. This is the number of square inches in the duct area.
Divide by 1to determine how many square feet are in the duct area.
If selecte Flexible roughness is 0. Duct areas in square feet can be calculated by using geometry rules for round areas. 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.
It calculates both rectangular and round duct dimensions. To calculate the rectangular duct area , we need height, width and length. Standard Autocad drawings shows the width and height of duct at various regions where as length should be taken out using a hand scale by measuring the duct at each positions.
How do you calculate the CFM of a duct?
How to calculate duct area to square feet? Equivalent diameter is the diameter of a circular duct with similar pressure loss as an equivalent rectangular duct. Enter air flow and its velocity in air duct sizing calculator to find the diameter of duct size.
Ductulator calculats duct dimensions using equal friction method or velocity method. Enter Duct Airflow (CFM), Duct Velocity (FPM), Duct Length and the number of bends. Duct calculator for pc.
OK to calculate but in professional it is not like this. Because of this, HVAC professionals and amateurs alike typically don’t calculate the final HVAC ducting size by themselves. Darcy-Weisbach-Colebrook equations). A i = area of duct (ft 2) d f = diameter of duct (ft) d i = diameter of duct (in) a i = width of duct (in) b i = width of duct (in) Example - Air Flow Velocity in a Duct.
In order to calculate the area of a circle you need to know its diameter or radius. The diameter of a circle is the length of a straight line from one side of the circle to the other that passes through the central point of the circle. You must have a project open in order to open this page.
The surface area of ducts in unconditioned spaces is an important factor in determining the amount of loss or gain due to ductwork in the system. When you first learned to calculate two-dimensional area , you probably practiced with squares and rectangles, using the simple formula length × width. FIELD DUCT SIZING CHART Rectangular sheet metal duct =.
Pi is a constant used in equations involving circles, and is always equal to the same value - approximately 3. The radius can be any measurement of length. This calculates the area as square units of the length used in the radius. This tool will calculate the area of a circle from the diameter, and will convert different measurement units for diameter and area.
Enter the diameter or two times the radius of a. Calculated out this gives an area of 28.
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