The security door of the newly bought house is opened inside, and the floor heating must be changed,

The security door is located at the main entrance, and in the event of an emergency, it is easier to open it outward, but if it is opened inward, it is very annoying to let the door open the position first. That's why it's more open to the outside world.

Almost all of the newly bought houses are installed engineering security doors, the quality is honestly more unbearable, it is recommended to reinstall a better Grade A security door, the lock cylinder is best C-level.

Which style, whether you invalidate the decoration key or it automatically scraps itself causes you to not be able to open the door.

Wrong, do you mean that opening outside doesn't affect the next door? It's just that the developer said it would affect fire protection? >>>More

In real life, when people encounter that the door lock is not easy to open, they will generally lubricate the lock cylinder with oil, although it can solve the problem, but if you do it often, a large amount of dust will enter and mix with the oil, which is not good for the door lock. I think the best way to do this is to scrape the pencil into lead powder. >>>More