Discussion
A filter removes 80 per cent of particles in a single pass and the whole room air passes through it 4 times an hour. The equivalent clean air delivery rate for a \( 50 \ \mathrm{m^3} \) room is
Answer: C
Multiply the recirculation flow \( 50 \times 4 = 200 \) by the single pass efficiency of 0.8. Recirculating filtration adds to the dilution the outdoor air already provides, but only for contaminants the filter actually captures.
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