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See, that's the funny thing about calculating a volumetric flow rate of air. What's its pressure? What's its temperature?
Volumetric flow rate by itself is meaningless when throttling is considered. It's the mass flow rate that actually matters, and if you have a large volumetric flow rate at 20 inHg vacuum on one side of a throttle valve, it's equivalent to about about a 2/3 slower volumetric flow rate at atmospheric on the other side of the throttle valve. In both cases, though, the mass flow rate is the same - it has to be.
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