I have been trying to figure out what I will need for my intake, and think I need about 160 square inches. I was thinking of using either 14 or 16 inch ducting, but I can't get ahold of any, and it is much more expensive. I guess my question is: Are two 8 inch ducts the same as one 16 inch?
Yes. If your looking for large sized ducting your going to have to visit a ac business that sells to the general public. You won't find that at home depot. Too specialized just use the two 8" if it works for your application
To me it seems like two 8 inch ducts would not be the same as one 16 inch. I drew up a quick image in paint to describe my train of thought... can anyone explain if this is the same with circular ducting?
An 8" duct provides 350 CFM of free-flow fresh air Common duct sizes and area (PI * R squared): 6" = 28.27 square inches 8" = 50.27 square inches 10" = 78.54 square inches 12" = 113.10 square inches does this help
I've taken ventilation info from here and it just doesn't work unless [Archive] - Lampwork Etc. taken from here... seemed relevant... trying to help