Products ventilation by means of ventilation dilution or ventilation exclude other means, to control the spread of air pollutants and hazards, indoor and outdoor air quality of the environment protection a building environmental control technology. The ventilation system is to achieve ventilation features, including air intake, air vents, air supply piping, fans, cooling and heating, filter, and a set of devices, including control systems, and other ancillary equipment. The product attributes of the fresh outdoor air, after filtration, introduced into the chamber, and after the energy exchange between the indoor stale air exhausted to the outside, to reduce energy loss. The use of the fresh outdoor air, after filtering, the introduction of the indoor, outdoor and indoor stale air is discharged through the energy exchange, reduce energy loss. The main characteristics of the fresh outdoor air, after filtration, introduced into the chamber, and after the energy exchange between the indoor stale air exhausted to the outside, to reduce energy loss. The main purpose first, due to the process of living and life with fresh outdoor air updates indoor pollution of the air, in order to maintain the cleanliness of indoor air to reach the level of a minimum standard. Second, to increase the body heat and prevent discomfort caused by moisture from the skin, such ventilation may be referred to as thermal comfort ventilation. Third, when the indoor temperature is higher than the outdoor air temperature, so that the building component cooling, such ventilation named the building's cooling ventilation. Note first, due to the process of living and life with fresh outdoor air updates indoor pollution of the air, in order to maintain the cleanliness of indoor air to reach the level of a minimum standard. Second, to increase the body heat and prevent discomfort caused by moisture from the skin, such ventilation may be referred to as thermal comfort ventilation. Third, when the indoor temperature is higher than the outdoor air temperature, so that the building component cooling, such ventilation named the building's cooling ventilation. Examples of applications of other explanatory underground space in urban rail transportation (including subway), underground complex, tunnels, civil air defense projects, clean technology semiconductor industry, precision machinery, aerospace, printing, medicine, pharmaceuticals, genetic engineering and other safety ventilation mine ventilation, fire row smoke, anti-terrorist attacks ventilation industrial building ventilation cigarette factory, automobile manufacturing, foundry and other agricultural vegetable greenhouses in the field of large-scale farming, botanical gardens, zoos and other special areas of hydropower, communications room trading instructions, determine the design drawings, making products 3, confirm receipt 4, installation and commissioning of 5, acceptance