If the required level of protection is higher, you can consider choosing a closed sliding door.
如果要求的防护等级较高，可以考虑选择封闭的平移门。
Closed translation telescopic door can block the outside line of sight, durable.
封闭式平移伸缩门可阻挡外界视线，坚固耐用。
However, from the perspective of confidentiality, the door body should be more than 2m, which can block the line of sight of the outside world and prevent easy climbing, and other lower security levels can be considered telescopic doors.
但从保密的角度考虑，门体应在2m以上，既能挡住外界的视线，又能防止容易攀爬，其他安全等级较低的可以考虑伸缩门。
After determining the product type of the telescopic door, pay attention to whether there is enough space to install the telescopic door.
在确定伸缩门的产品类型后，还要注意是否有足够的空间安装伸缩门。
Only enough space can ensure the normal opening and closing operation of the door.
只有足够的空间才能保证门的正常启闭操作。
The width of the retractable door shall not be less than 80 cm.
伸缩门的宽度不得小于80厘米。
Find a level floor when installing.
安装时找一个水平地面。
If flat ground cannot be found, a slope of about 30 cm can be allowed.
如果找不到平坦的地面，可以允许30厘米左右的坡度。
However, the telescopic door should be made of track, and the opening of the door should be greater than 15m.
但伸缩门应采用轨道制作，门洞开度应大于15m。
Retractable door with double door structure is good.
双门分体结构的伸缩门是好的。
