What is the difference between the embedded pass box and the external pass box?

The internal transfer window, also known as the embedded transfer window, and the external transfer window, also known as the external hanging transfer window, mainly differ in the following aspects:
Installation method
The embedded transfer window is embedded in the wall to make the transfer window flush with the wall surface. When installing, holes need to be drilled in the wall. The size of the holes is generally about 10MM larger than the outer diameter of the transfer window. Then, place the transfer window in the middle of the wall, keep it balanced and fixed, use rounded corners or other decorative strips to decorate the gap between the transfer window and the wall, and apply glue for sealing and decoration.
The external transfer window is fixed to the outer surface of the wall through bolts or hangers, etc., and is not embedded in the wall. This installation method is relatively simple. There is no need to drill holes in the wall. Just fix the transfer window directly to the wall surface. The installation speed is fast and the changes to the wall structure are relatively small.
Appearance and space utilization
After the embedded transfer window is installed, it is flush with the wall, making the overall appearance more beautiful and tidy. It can make the building structure more visually unified and harmonious and is especially suitable for places with high requirements for spatial layout and aesthetics, such as operating rooms and clean laboratories. However, it will occupy a certain amount of wall space, has certain requirements for the thickness of the wall, and its installation position is relatively fixed. Changing the position later may cause damage to the wall.
The external transfer window is installed on the outside of the wall and will protrude from the wall surface. In terms of appearance, it may not be as beautiful as the built-in one. However, it does not occupy the internal space of the wall, has no special requirements for the thickness of the wall, and the installation position is relatively flexible. It can be installed at a suitable position on the wall according to actual needs. If the transfer window needs to be moved or replaced later, it is relatively convenient and has a relatively small impact on the wall.
Sealing performance and cleanliness effect
Embedded transfer Windows, being embedded in the wall, have a tighter combination with it. When installed properly and with good sealing treatment, they have better sealing performance, effectively preventing external air, dust, and other contaminants from entering the clean area. This is more conducive to maintaining the cleanliness and airflow stability of the clean room, reducing the risk of cross-contamination, and is suitable for environments with extremely high cleanliness requirements. Such as biopharmaceutical workshops, microelectronics clean workshops, etc.
Although external transfer Windows can also achieve good sealing through sealing strips and other means, since they are installed on the wall surface, there is a certain gap between them and the wall. In terms of sealing performance, they may be slightly inferior to built-in transfer Windows. However, in some places where the requirements for cleanliness are not extremely strict, through reasonable sealing design and maintenance, external transfer Windows can also meet the basic usage requirements.
Installation difficulty and cost
The installation of embedded transfer Windows requires treatments such as opening holes in the wall, which makes the construction relatively difficult and demands high technical skills from the installers. At the same time, issues such as the structural safety of the wall also need to be taken into consideration. In addition, due to the rather complex installation process, it may involve some additional materials and procedures, such as decorative strips and sealants, so the installation cost is relatively high.
The installation of external transfer Windows is relatively simple and quick. There is no need for large-scale wall renovations. The installation difficulty is low and the installation cost is relatively low. In terms of labor costs and material costs, it may be more economical than that of embedded transfer Windows.