Ventilation efficiency.

Due to energy shortage and increased energy costs, there seems to be conflicting interest between hygiene and comfort on one hand, and energy economy on the other. Fortunately, it is possible to increase the ventilating air change rate in the zone of occupancy without increasing the air change rate for the whole room in question. Describes different methods for measuring and defining ventilation efficiency, and tests some of these methods in the laboratory, along with different ventilation systems.