I see what you mean, but considering the velocity, I don't think it's going to be an issue: I plan to keep the inlet (see pic, imagine the area where the yellow bars extends) to the equivalent cross section as the 1/2 inch tube, so...
1/2 in diameter = 0.196 sq. in. cross section
Take that cross section, and apply that measurement in a cylindrical pattern.
.196 sq in surface of cylinder = 0.125 inch height. (1/8 of an inch).
I don't think that 1/8 of an inch would be an issue.
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