Openings and ventilation for buildings.

Describes the basic relation between pressure difference and air flow rate across an opening under steady state conditions. Taking the ventilation system into account, the pressure difference pattern across building enclosures andthe air leakage characteristics of exterior walls, interior separations and various service shafts must be understood, but at present little of this information has been available for actual buildings. Presents new data on the air leakage characteristics and natural ventilation rates for sound insulating houses. Also discusses unsolved problems, such as the indoor air pollution caused by the air-tightness of buildings, the increase in air leakage caused by stack effect and the changes in the ventilation rates caused by fluctuations in the wind.