In climates with low night-time temperatures, an energy-efficient way of cooling a house is to install a fan in the ceiling that draws air from the interior of the house and discharges it to a ventilated attic space. Consider a house whose interior air volume is 740 m. The air in the house is to be exchanged once every 20 minutes. Determine the required flow rate of the fan in cubic meters per second. The flow rate is m/s.