How many types of transfer Windows are there?

The transfer window is a device used for transferring items between clean rooms and non-clean rooms or between areas of different cleanliness levels. It is mainly used to reduce the number of times the door is opened and prevent cross-contamination. According to different classification criteria, transfer Windows can be divided into various types. The following are the common classifications and characteristics:
1. Classification by usage scenarios and cleanliness levels
1. Ordinary transfer window
Features: Suitable for general clean workshops (such as 10,000-level and 100,000-level cleanrooms), with a simple structure. The two side doors are equipped with interlocking devices to prevent them from opening simultaneously, basically meeting the dust-proof requirements for item transfer.
Application scenarios: Food processing, electronic assembly, general laboratories, and other places with medium cleanliness requirements.
2. Clean transfer window (High-efficiency filtration type)
Features: Equipped with a high-efficiency filter (HEPA) inside, it can perform air flow purging on the items being transferred, further filtering out particles in the air to ensure cleanliness during the transfer process (such as Class 100 and Class 1000 cleanroom standards).
Application scenarios: Pharmaceutical production, precision instrument manufacturing, sterile laboratories, and other scenarios with high cleanliness requirements.
3. Biosafety transfer window (Negative pressure type)
Features: It has a negative pressure function to prevent the leakage of internally polluted air. Some models are equipped with ultraviolet sterilization lamps, which can disinfect biological samples and experimental equipment to prevent cross-infection.
Application scenarios: Biosafety laboratories (BSL-2, BSL-3), microbiological research, infectious disease prevention and control, and other high-risk environments.
Ii. Classification by Structure and Function
Standard transfer window
Features: Conventional rectangular structure, the doors on both sides are manually or electronically interlocked, and the interior can be equipped with ultraviolet lamps (for disinfection). Some models come with observation Windows.
Advantages: Low cost, easy installation, suitable for medium and small-sized clean rooms.
2. Air shower type transfer window
Features:
It is equipped with an internal fan and a high-efficiency filter. When items are being conveyed, the doors on both sides automatically close. The internal air shower system (with an airflow velocity of ≥20m/s) cleans the surface of the items to remove dust particles.
The time for the air shower can be set (usually 5 to 30 seconds), and the other side door will unlock automatically after the air shower is completed.
Advantages: It has a more thorough disinfection and purification effect and is suitable for scenarios with high cleanliness requirements.
3. Laminar flow transfer window
Features:
It adopts a vertical or horizontal laminar flow design, with the internal airflow flowing in one direction to avoid the generation of vortices and maintain a high cleanliness environment (static Class 100).
It can continuously transfer items and is suitable for scenarios with frequent transfers (such as continuous operation on production lines).
Advantages: Stable cleanliness, suitable for occasions with extremely high requirements for transfer efficiency and cleanliness (such as the production of sterile preparations).
4. Weighing transfer window
Features:
Integrated with an electronic weighing function, it can weigh items simultaneously during transfer, avoiding the need for secondary box opening operations and reducing the risk of contamination.
Some models are equipped with dust covers and peeling functions, making them suitable for the transfer of medicines and precision raw materials.
Application scenarios: Weighing of raw and auxiliary materials in the pharmaceutical industry, weighing of laboratory samples, etc.
5. Explosion-proof transfer window
Features:
Explosion-proof materials (such as stainless steel explosion-proof plates) and explosion-proof electrical components are adopted to prevent internal explosions caused by sparks.
It is suitable for dangerous environments where flammable and explosive items (such as chemicals and solvents) are transferred.
Application scenarios: Explosion-proof places such as chemical industry, petroleum, and dangerous goods storage.
Iii. Classification by Opening Method
Manual transfer window
Features: The two side doors are manually pushed and pulled or opened in a swing manner. They are prevented from opening simultaneously through mechanical interlocking devices. The operation is simple and the cost is low.
Applicable scenarios: Situations where the cleanliness requirement is not high and the transfer frequency is relatively low.
2. Electric transfer window
Features:
The door body is electrically controlled (such as a sensor switch, or button control), automatically interlocked, and can be linked with the cleanroom control system (such as PLC control).
Support remote operation or integration with production lines to enhance the degree of automation.
Applicable scenarios: large clean workshops, automated production lines, and scenarios with high-frequency transmission demands.
Iv. Classification by material
Stainless steel transfer window
Features: Made of 304 or 316 stainless steel, it is corrosion-resistant and easy to clean, suitable for humid, high-cleanliness, or corrosive environments (such as pharmaceutical and food workshops).
2. Steel plate plastic-coated transfer window
Features: The main body is made of cold-rolled steel plate, with a surface treated by plastic spraying. It has a relatively low cost, but its corrosion resistance is slightly lower than that of stainless steel. It is suitable for dry and moderately clean environments (such as electronic workshops).
V. Other Special Types
1. Cold chain transfer window
Features: Built-in temperature control system (such as refrigeration or freezing function), which can maintain the temperature of items (such as 2-8℃) during the transfer process, preventing the deterioration of biological samples, medicines, etc.
Application scenarios: Hospital pharmacies, biological sample banks, vaccine storage and transportation, and other cold chain scenarios.
2. Double-door transfer window (double-door interlocking type)
Features: The doors on both sides open directly, with a compact structure, making it suitable for places with limited space. The interlocking function ensures the isolation of airflow.
3. Transfer window with sterilization function
Features: Standard equipped with ultraviolet germicidal lamps (UV-C) or ozone generators, it can disinfect the surface of items before transfer, reducing the risk of microbial contamination. It is commonly found in medical and biological laboratories.
The key factors for choosing a transfer window
Cleanliness level requirements: Select the corresponding filtration efficiency transfer window (such as high-efficiency filtration or ordinary filtration) based on the cleanliness of the usage scenario (such as Class 100, and Class 10,000).
Characteristics of the transferred items: Whether explosion-proof, weighing, temperature control, or sterilization functions are required, and whether they are flammable, explosive, or special items such as biological samples.
Space and installation conditions: The size of the transfer window should match the size of the door opening. For electric types, power supply should be reserved, and for air shower types, exhaust ducts should be considered.
Degree of automation: For production line connection scenarios, electric or laminar flow transfer Windows is preferred to enhance efficiency. Manual type can be selected for small-scale scenarios.
Through the above classification, the most suitable type of transfer window can be selected according to specific needs to ensure the pollution control and item transfer efficiency of the clean room.