Quinn88
Member
I am building a box with round tube port the person that helped me with the design suggested 6" diameter by 14" long port due to that size only being available in sections that cost $50 I have to use 4" diameter tube when I did the port calculator it says the port only needs to be 5" long and I used two different calculators with same result and when I imput the suggested 6" diameter it gives me the 14" long this seems very odd to me Does any one know if this calculation is accurate if not a good port calculator also the box is 3.7^3ft