The rateof exchange between indoor and outdoor air, which depends on the construction of the house, the ventilation habits of the inhabitants, and the sealing of Windows.
室内外空气的交换速度，这取决于房屋的构造、居住者的通风习惯和窗户的密封程度。
2
The killing rateof aerobic compost of compelled ventilation to coliform can reach 100% in the successful condition.
保证堆肥顺利进行的条件下，强制通风好氧堆肥对大肠杆菌的杀灭率可达100%。
3
Conclusion: the good mechanical ventilation in patients with care can greatly increase the survival rateof patients.