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I looked there too. It's not a metric conversion, so I couldn't come up with anything, plus you have to know the actual "weight" to do it. It's a conversion from cubic feet to pounds.
There was one interesting site which explained the discovery of the weight of air and vacuums, it was a museum of science and industry in Italy. But there again, it also said how the weight of air changed with altitude, so there is no one correct answer, it changes.
It would be easy to do if you knew the exact weight of the cubic foot of air, then you would just multiply by the cubic feet per minute, which is just the rate of flow.
Gilly
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