What should I do if the door leaf of the anti theft door falls a little bit after many years

There is no problem with this, the heavy iron sheet of the door panel will be used thicker, and the hinge will also be larger, and those fire doors are all very heavy, with fireproof cotton and gypsum board added to them.

Dear, please be sure to find a professional to do such a thing, it may be easy to disassemble, and it may be difficult to install it back as it is to ensure a smooth switch. It is recommended to go to the building materials market to find and sell the dismantling and installation of security doors, and you can also find workers or property professionals. You may need to spend a few hundred dollars, but it is more worry-free and more secure.

Your question is too unprofessional, the security door has a thickness of the position, that is, the door frame, the door leaf, the door panel, the thickness of the door leaf is the thickness of the opening and closing door, for example, there will generally be 90, 68, 50, there is no difference, you are talking about the same concept.

That should be because the plastic sealing strip between the door leaf and the door frame is too tight (thick), so that when the door is closed, the door leaf first contacts the sealing strip, and the sealing strip is elastic, and this elasticity affects the normal closure of the door - the door leaf will pop out. >>>More

There is no way to install it separately, because it is all debugged and installed at the factory. Only pay attention to it during construction.