How to install the anti-theft door chain？

Everyone should be familiar with anti-theft door chains. The anti-theft door chain is mainly installed on the inside of the anti-theft door, and its main function is to prevent strangers from knocking on the door. If there is no cat eye installed at home, you can open the door crack to see visitors or receive express mail, without worrying about being broken into by strangers.

1. After determining the size of the doors, windows, and walls, the door frame of the anti-theft door can be fixed to the wall using expansion bolts. It can also be embedded with iron parts at the opening when building the wall, and welded firmly with the door frame connection during installation. Regardless of the connection method used between the door frame and the wall, there should be no less than 3 fixed points on each side and they should be firmly connected. When installing the anti-theft door, it should be hung upright first, temporarily fixed after the size is appropriate, and calibrated and adjusted. Only after there is no error can the connection and anchoring be carried out.

   2. Eliminate the gap between the door frame and the wall to avoid making strange noises when entering the air. The gap between the door frame and the wall should be filled with cement or sealed with expansion agent, and covered with a special plastic cap. If there is a gap, it will cause the phoenix to enter, and the louder the wind, the louder the noise.