PCIE导风罩，带有一个4020风扇，适合给1、4槽位使用标准半高设备使用，中间2、3槽位空置或使用较短设备，可根据自己需求修改模型文件

PCIE fan duct with a 4020 fan, suitable for 1, 4 slots using standard half-height equipment, in the construction of 2, 3 slots vacant or the use of shorter equipment, according to their own needs to modify the model file