1. Most network cabinets use screw baffles to block the empty slots of PCI and other slots, but a considerable part still use disposable baffles. For this kind of chassis, the motherboard has to be removed every time a new PCI card is installed, which is quite troublesome.

2.不可拆卸的前面板

2. Non removable front panel

大多数的网络机柜的塑料前面板都是用卡子或螺丝固定在箱体上的，可以拆卸下来，但也有少数机箱是用塑料铆钉固定在机箱前架上的，一旦出现开机开关卡死，或指示灯脱落需要卸下面板修理时，这种不可拆卸前面板的机箱就是一个严重的问题。

The plastic front panel of most network cabinets is fixed on the box with clips or screws and can be removed, but a few cases are fixed on the front frame of the box with plastic rivets. Once the power on switch is stuck or the indicator light falls off and needs to be removed for repair, this non removable front panel case is a serious problem.

3.风扇设计的谬误

3. Fallacy of fan design

风扇并不是越多越好，网络机柜风扇的设计是一个系统工程，设计时关注“风道”、风孔大小和风孔位置、进风值与出风值的匹配等单纯靠增加风扇数量，可能会导致风力相互抵消，反而使热量无法排出。

The more fans are not the better. The design of network cabinet fans is a systematic project. During the design, attention is paid to the "air duct", the size and location of air holes, the matching of inlet and outlet values, etc. simply increasing the number of fans may cause the wind force to offset each other, but the heat cannot be discharged.

网络机柜的侧板风扇，应该选择大型低速的进风风扇。网络机柜顶部的风扇，位置应尽量靠后。风扇设计中的一个常见问题，就是不为风扇安装过滤网，这样会使电磁屏蔽性能下降，同时也会使风扇积灰。

For the side plate fan of the network cabinet, a large low-speed air inlet fan should be selected. The fan on the top of the network cabinet should be located as far back as possible. A common problem in fan design is that the filter screen is not installed for the fan, which will not only reduce the electromagnetic shielding performance, but also cause the fan to accumulate dust.

4.卡式结构的问题

4. Problems of card structure

卡式结构虽然方便，但这种设计的大问题就在于它对配件的尺寸公差要求比较严格，不像螺 钉结构那样允许配件有的“错位”，如果强行装上，会带来配件变形的隐患。

Although the card structure is convenient, the big problem of this design is that it has strict requirements on the dimensional tolerance of accessories. Unlike the screw structure, it allows some "dislocation" of accessories. If it is forcibly installed, it will bring the hidden danger of deformation of accessories.