Discussion
A \( 45 \ \mathrm{m^3} \) room at 3 air changes per hour is ventilated at
Answer: A
Correct answer: \( 135 \ \mathrm{m^3/h} \)
Flow is the air exchange rate multiplied by the volume:
\[ Q = nV = 3 \times 45 = 135\ \mathrm{m^3/h} \]
This is the inverse of the earlier calculation and the two are worth practising together, since specifications are written both ways - a code may require so many air changes per hour, while a fan is selected on cubic metres per hour. The volume is what converts between them.
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