Equal aperture sizes in a house do not provide equal comfort levels. As shown in Fig. 8a, it is preferable to have a larger inlet aperture than a larger outlet aperture. This would reduce the stagnation zone in the house. A larger inlet aperture can also provide a larger ventilation rate. For example, with an inlet area of 32 m2 and an outlet area of 16 m2, the corresponding ventilation rate is 9.6 m3/s. By swapping the inlet areas with those of the outlets, while keeping the total aperture area unchanged, the ventilation rate is reduced to 6.4 m3/s