I need to create a program that will calculate the materials used to build HVAC custom vents and ducts and such. The current system uses a formula based on girth.
I don't have access to the code so I have to create something new using girth or some other method. The basic inputs are length, height, width plus a variable cost...
Can anyone provide a formula that will basically compute the amount of sheet metal in a tube, or box, or plane... or a starting point?
Also, any information on how girth could be used in such a calculation. Thank you.