Laminar flow pass box and VHP pass box have obvious differences in working principles, functional features, application scenarios, etc., as follows:
Working principle
Laminar flow transfer window: By filtering the airflow through primary and high-efficiency two-stage filters, a laminar flow is formed inside the transfer window. The airflow direction is usually upward and downward, which can effectively remove the dust on the surface of the material and prevent the dust from being carried into the clean room by the material.
VHP transfer window: By using a vaporized hydrogen peroxide generator to produce hydrogen peroxide gas, the outer surface of the items inside the transfer window is subjected to biological decontamination treatment. The hydrogen peroxide gas destroys the cell structure of microorganisms to achieve the purpose of sterilization.
Working principle
Laminar flow transfer window: By filtering the airflow through primary and high-efficiency two-stage filters, a laminar flow is formed inside the transfer window. The airflow direction is usually upward and downward, which can effectively remove the dust on the surface of the material and prevent the dust from being carried into the clean room by the material.
VHP transfer window: By using a vaporized hydrogen peroxide generator to produce hydrogen peroxide gas, the outer surface of the items inside the transfer window is subjected to biological decontamination treatment. The hydrogen peroxide gas destroys the cell structure of microorganisms to achieve the purpose of sterilization.
（Laminar flow pass box） （VHP pass box）
Functional features
Laminar flow transfer window: Its main function is to ensure the cleanliness of the airflow during the transfer process. The internal cleanliness can reach Class A. At the same time, it is usually equipped with ultraviolet lamps, which can perform simple ultraviolet disinfection on items. In addition, it also features differential pressure display, electronic door interlocking and other functions to ensure the normal operation of the equipment and that the environment in the clean area is not affected.
VHP transfer window: It has a powerful sterilization function, effectively killing bacteria, fungi, viruses and spores and other microorganisms. Moreover, hydrogen peroxide is easy to decompose and leaves no harmful residues. Meanwhile, PLC automatic control is usually adopted, which can precisely control each stage of the sterilization process and has functions such as hydrogen peroxide gas concentration monitoring and ventilation residue removal.
Application scenarios
Laminar flow transfer window: Mainly applied in places with high cleanliness requirements, such as the clean areas of biopharmaceuticals, research institutions, disease control centers, large hospitals, etc. It is used for the transfer of small items between clean areas and between clean areas and non-clean areas to reduce the number of times the clean room door is opened and lower the risk of contamination.
VHP transfer window: It is suitable for various clean and dry items that need to be transferred in aseptic production, such as the outer packaging of packaging materials, instruments, raw and auxiliary materials, etc. entering the A and B grade critical areas. It is especially suitable for occasions with extremely high sterilization requirements, such as aseptic inspection laboratories and microbiology laboratories.
Structural design
Laminar flow transfer window: Generally, it adopts a double-layer shell with inner and outer layers. The inner periphery is treated with arcs to ensure seamless connection and facilitate cleaning. The high-efficiency filter can be disassembled and installed separately from the upper box. The bottom is usually made of 304 stainless steel cold-rolled plate with perforated design and is equipped with reinforcing ribs.
VHP transfer window: It usually has a more complex structure. Besides the double-door structure and pneumatic sealing/locking device, it is also equipped with components such as a hydrogen peroxide generator, a precious metal catalyst, an internal pressure difference sensor, an internal temperature and humidity sensor, and an internal hydrogen peroxide concentration sensor, to achieve the generation, circulation, decomposition of hydrogen peroxide and the monitoring and control of the sterilization process.
Laminar flow transfer window: Its main function is to ensure the cleanliness of the airflow during the transfer process. The internal cleanliness can reach Class A. At the same time, it is usually equipped with ultraviolet lamps, which can perform simple ultraviolet disinfection on items. In addition, it also features differential pressure display, electronic door interlocking and other functions to ensure the normal operation of the equipment and that the environment in the clean area is not affected.
VHP transfer window: It has a powerful sterilization function, effectively killing bacteria, fungi, viruses and spores and other microorganisms. Moreover, hydrogen peroxide is easy to decompose and leaves no harmful residues. Meanwhile, PLC automatic control is usually adopted, which can precisely control each stage of the sterilization process and has functions such as hydrogen peroxide gas concentration monitoring and ventilation residue removal.
Application scenarios
Laminar flow transfer window: Mainly applied in places with high cleanliness requirements, such as the clean areas of biopharmaceuticals, research institutions, disease control centers, large hospitals, etc. It is used for the transfer of small items between clean areas and between clean areas and non-clean areas to reduce the number of times the clean room door is opened and lower the risk of contamination.
VHP transfer window: It is suitable for various clean and dry items that need to be transferred in aseptic production, such as the outer packaging of packaging materials, instruments, raw and auxiliary materials, etc. entering the A and B grade critical areas. It is especially suitable for occasions with extremely high sterilization requirements, such as aseptic inspection laboratories and microbiology laboratories.
Structural design
Laminar flow transfer window: Generally, it adopts a double-layer shell with inner and outer layers. The inner periphery is treated with arcs to ensure seamless connection and facilitate cleaning. The high-efficiency filter can be disassembled and installed separately from the upper box. The bottom is usually made of 304 stainless steel cold-rolled plate with perforated design and is equipped with reinforcing ribs.
VHP transfer window: It usually has a more complex structure. Besides the double-door structure and pneumatic sealing/locking device, it is also equipped with components such as a hydrogen peroxide generator, a precious metal catalyst, an internal pressure difference sensor, an internal temperature and humidity sensor, and an internal hydrogen peroxide concentration sensor, to achieve the generation, circulation, decomposition of hydrogen peroxide and the monitoring and control of the sterilization process.
