imagine with mei want one side to be plastic to see whats happening insideand the other 3 sides is iron sheetits a straight duct ,,, no anglesvolume of the duct = 0.35 x 0.35 x 2.5a professor told that the best thickness for plastic side is 3mmand the iron sheet is 0.6mmis that right??if it is wrong tell me the best thickness for both??
would increase the thickness
