Natural ventilation refers to an open-sided house with, most commonly, curtains (although flaps or doors
can also be used) on the sidewalls (Figure 28). The operation of open-sided houses involves opening
and closing the curtains or flaps to allow convection currents (wind or breezes) to flow air into the house.
Generally speaking, open-sided houses are best managed only when the ambient conditions are close to
the required set point temperature in the house.