A centrifugal fan rotating at \(600\) rpm delivers \(70\ \mathrm{cu.m/s}\) of air. If the speed is reduced to \(300\) rpm, the quantity of air delivered in \(\mathrm{cu.m/s}\) will be
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Fan affinity law:
\[
\boxed{Q\propto N.}
\]
If the speed is halved, the air quantity is also halved.