Air distributors are usually placed in ventilating systems to keep the balancing of volume flow rates between each branch of ducts.
在许多通风系统中，常采用风量分配器来保证在各送风支路风量发生变化时系统风量的平衡。
2
If the cross section area of the two branching ducts are different, the Included angle on the smaller branch duct against the extended center line is usually bigger.