Air distribution and air diffusion . aerodynamic testing and rating of constant and variable flow rate single or dual duct boxes and single duct units 空气的分配和扩散.恒定和可变流量单管或双管箱和单管装置的空气动力学试验及评价额定值
2.
A typical dual duct system would have 2 zone supply air paths ? one for the hot air and one for the cold air ? and 1 zone return air path 而对于典型的双管系统，则由两条区域送风路径（一条用于热空气、一条用于冷空气）和一条区域回风路径组成。
