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It's best to find a property and find a professional to repair it, I told you you you can't understand it.
1.The gap between the door gap of the anti-theft door is: the standard stipulates that "the gap between the door leaf and the hinge edge of the door frame should not be greater than 2mm, and the gap between the opening edge of the door and the door frame should not be greater than 3mm.""Then: General defense. >>>More
There is a property management community, as long as the owner pays the fees on time, the property company has no reason not to care, first of all, you have to go to the property to repair, to see the property of the degree, and the existing property law can be used as a basis. Talk to the property.
Security is voluntary, and it's okay if you don't press it.
It's everywhere, I have one here who specializes in this business, do you want to get acquainted.
If there is no security door when buying a house, the rear installation is to be shared by the residents, and if it is a house purchase, it is a matter for the developer.