The above factors, apart from psychological, are responsible for this annoyance factor. In poorly ventilated rooms people feel unable to concentrate, complain of drowsiness and headaches. This is called the Sick Building Syndrome. People who live or work in such places are more prone to infection. A change of Air A human being needs 3000 cft of fresh air each hour.
Air change is more important than the cubic space requirement.
It is recommended that in a living room, there should be 2 or 3 air changes and in workroom there should be 4 to 6 air changes. The optimum floor space requirements per person vary from 50 to 100 sq. A house should have the following devices to enhance natural ventilation. Windows Windows let in air. This is called cross ventilation and this ensures fresh air supply.