Fresh air volume

Research about fresh air volume, the western countries as early as in the early 90s of the 20th century began, from Canada, the United States, Western Europe, South America 85 buildings IAQ (indoor air quality) poor building survey results, in lead to poor IAQ of all the reasons, Xinfengliang inadequate row in the first place, accounted for 57%, followed by indoor pollution sources increased. The occupational safety and Health Research Institute survey also showed that indoor air affect human health factors, poor ventilation accounted for 48%, the members of the International Association of indoor air, the indoor air journal editor Sundeu professor of 160 buildings in Sweden were studied and found fresh air amount is large, the risk of "sick building syndrome is smaller.