1)balanced ventilation system,平衡通风系统2)balance system of ventiation,均衡制通风系统3)Balancing Ventilation,平衡通风4)ventilation plan,通风系统平面图5)balanced draught,平衡式通风6)The methods of electric power balance test and calculation in fan system,GB/T 13467-1992 通风机系统电能平衡测试与计算方法
