选卷帘门，第一个纠结往往是“手动还是电动”。电动门看起来出色，按个遥控器就能开关，但价格比手动门贵出一大截。多花的钱值不值，关键看一个数据：你一天要开关几次。

The first dilemma when choosing a rolling shutter door is often whether it is manual or electric. Electric doors look high-end and can be opened and closed by pressing the remote control, but they are much more expensive than manual doors. Whether the extra money is worth it or not depends on one data point: how many times a day do you need to switch on and off.

手动卷帘门的“省”是有条件的。 手动门依靠中心轴上的扭簧平衡门体重量，拉起来不算费力。如果你的门一天只开一两次，比如仓库的备用通道、不常使用的车库后门，手动门完全够用。省下的钱可以花在更好的材质上——比如把彩钢板升级成不锈钢，耐用性提升比“电动”实在得多。

The "savings" of manual rolling shutter doors are conditional. The manual door relies on the torsion spring on the central axis to balance the weight of the door body, making it easy to pull up. If your door is only opened once or twice a day, such as the backup aisle in the warehouse or the infrequently used garage back door, a manual door is completely sufficient. The saved money can be spent on better materials - such as upgrading color steel plates to stainless steel, which greatly improves durability compared to "electric" ones.

电动卷帘门解决的是“频率”问题。 商铺每天开关几十次，工厂通道每小时进出十几趟，手动门就变成了折磨。电机的价值不在于“出色”，在于把重复劳动变成一键操作。但电动门有一个容易被忽略的隐性成本：电机寿命。低端电机的碳刷和齿轮在频繁启停下磨损很快，三五年后维修或更换电机的费用可能抵得上当初省下的差价。选电动门时，电机的品牌和制动方式比门体材质更值得关注。

The electric rolling shutter door solves the problem of "frequency". Shops open and close dozens of times a day, factory passages enter and exit more than ten times an hour, and manual doors become torture. The value of motors does not lie in their "advanced" nature, but in turning repetitive labor into one click operation. But electric doors have an easily overlooked hidden cost: motor lifespan. The carbon brushes and gears of low-end motors wear out quickly after frequent starting and stopping, and the cost of repairing or replacing the motor may be worth the price difference saved in three to five years. When choosing an electric door, the brand and braking method of the motor are more worthy of attention than the material of the door body.

中速门是一个折中选项。 如果觉得普通电动门太慢、快速门又太贵，中速卷帘门的速度在每秒0.4米左右，比普通电动门快，比快速门便宜，适合需要一定通行效率但预算有限的场所。

Medium speed doors are a compromise option. If you feel that ordinary electric doors are too slow and fast doors are too expensive, medium speed rolling shutter doors have a speed of about 0.4 meters per second, which is faster than ordinary electric doors and cheaper than fast doors. They are suitable for places that require certain traffic efficiency but have limited budgets.

还有一个容易被忽略的场景：断电了怎么办。电动门通常配有手动离合装置，停电时可以切换为手动操作。但如果你的场所经常停电，或者门的位置不方便手动操作（比如高位卷筒），选门时就要确认手动机构的易用性，而不是等停电了才发现“打不开”。

Another easily overlooked scenario is what to do if there is a power outage. Electric doors are usually equipped with manual clutch devices, which can be switched to manual operation during power outages. But if your location frequently experiences power outages, or if the position of the door is inconvenient for manual operation (such as a high-level drum), when selecting the door, it is important to confirm the usability of the manual mechanism, rather than waiting until there is a power outage to discover that it cannot be opened.

手动还是电动，没有绝对的好坏。一天开两次的门，手动是理性选择；一天开五十次的门，电动是效率工具。先数清楚你的“开关次数”，答案自然就出来了。

Whether manual or electric, there is no absolute good or bad. Opening the door twice a day, manual operation is a rational choice; Opening doors fifty times a day, electricity is an efficiency tool. First count your 'number of switches', and the answer will naturally come out.

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