The gap between the anti theft door and the door frame is too large, and the air leakage is not soun

If the gap is too large (3 cm of the gap on all sides), you can add a steel square tube sub-frame with a thickness of 2 cm. I hope my answer can help you.

It stands to reason that the gap should not be too large, with a maximum gap of 1-2 cm, which is estimated to be the merchant's craftsmanship is not in place. >>>More

Hello, the gap between the door frame and the door hole is 1-2CM, which is easy to blow the styrofoam, and it is better to see the wall cracks after installing the sleeve line.

There are generally four sizes of standard domestic doors, which are represented by a four-digit number consisting of the width and height of the building opening. For example: when the width of the door opening is 1 meter, the height is meters, its specification is called 1021, and the commonly used specifications are etc.

Is your security door still under warranty? If you can find a store to change the door or return the door, if it is outside the warranty period, you can ask for a repair until you are satisfied.