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Can anyone explain the maths behind the statement:

Here is an example of a single-sided natural ventilation strategy for a classroom in a city location. This is designed to meet the requirement of 8 l/s per person or 5.5 air changes per hour, and to maintain a summer internal temperature of 27°C on a 24°C day with no wind.
The classroom is 7m wide, 8m deep and 2.5m high and has windows along one side, with a vertical depth of 1.6m. It is occupied by a class of 30 pupils and two members of staff. Therefore, the area of ventilation needed would be 3.17m2.

How is 3.17 arrived at?

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