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The metal mesh is embedded in a large wooden frame and welded firmly. In order to protect the spot shielding effect, the general door should be covered with at least two layers of metal mesh, and the spacing between the two layers is consistent with the spacing of the two nets in the shielding room. To achieve good contact and durability, the edges around the screen door must be welded with a metal plate of the same material, and the elastic contact sheet with high conductivity is fixed on the metal plate to ensure that the door is in good contact after closing. The door should also be equipped with a screw knob.

There are many people who do not understand the principle of screen doors, and think that electromagnetic shielding and shielding body grounding are related. In fact, there are only two factors that really affect the effectiveness of the shield: one is that the entire shield surface must be conductive and continuous, and the other is that there can be no conductor that directly penetrates the shield. There are many conductive discontinuities on the shield, the most important one is the non-conductive gap formed at the junction of different parts of the shield.These non-conductive crevices produce electromagnetic leaks, just as current leaks from gaps in containers.

One way to solve this leak is to fill the gaps with a conductive elastic material, eliminating points that are not conductive. And this conductive filling material is the electromagnetic sealing gasket. Exactly, whether the gap or hole will leak is taken from the size of the electromagnetic wavelength relative to the gap or hole, and when the wavelength is larger than the opening size, it will not produce obvious leakage. Electromagnetic shielding is a method of controlling electromagnetic interference by using the principle of metal isolation, induction and radiation propagation from one area to another.