How to ensure the airtightness of biosafety airtight transfer Windows

Ensuring the airtightness of biosafety airtight transfer Windows requires efforts in multiple aspects such as design, installation, testing, and maintenance. The specific measures are as follows:
Design and Manufacturing
High-quality sealing materials: Using high-quality sealing materials is the key to ensuring airtightness. Between the door frame and the door leaf of the transfer window, sealing strips made of silicone rubber or ethylene propylene diene monomer (EPDM) rubber are usually used. These materials have good elasticity, aging resistance, and corrosion resistance, and can maintain stable sealing performance during long-term use.
Reasonable structural design: The structural design of the transfer window should be conducive to achieving a good airtight effect. For instance, by adopting a double-door structure and setting up an intermediate sealing chamber to form an airlock chamber, the direct circulation of air can be effectively prevented. At the same time, the way the door is opened also affects its airtightness. Compared with traditional hinged doors, sliding doors can better fit the door frame when closed, reducing the gap.
Installation and Commissioning
Correct installation: The installation process must be carried out strictly by the manufacturer's installation manual. The transfer window should be installed on a flat and vertical wall surface to ensure there is no gap between it and the wall. Installers need to use professional tools and equipment to precisely position and fix the transfer window to avoid poor sealing due to installation deviations.
Sealing treatment: After installation is completed, the connection between the transfer window and the wall should be sealed. Sealant is usually used for filling the gaps to ensure that they are completely filled and prevent air leakage. At the same time, the door shaft, handle, and other parts of the transfer window also need to be sealed to prevent these parts from becoming air leakage points.
Commissioning and testing: After installation is completed, strict commissioning and testing are required. The airtightness of the transfer window is evaluated by detecting the leakage rate under different pressures. Common detection methods include the pressure attenuation method and the tracer gas method. The pressure decay method involves filling the interior of the transfer window with gas at a certain pressure, and then observing the pressure decay over time. Based on the rate of pressure decay, it is determined whether the airtightness meets the requirements. The tracer gas rule involves filling a mixed gas containing tracer gas into the transfer window and determining whether there is a leakage by detecting the concentration of the tracer gas in the surrounding environment.
Usage and Maintenance
Correct usage: Establish strict usage procedures. When operating the transfer window, the operator should follow the procedures correctly to avoid damaging the sealing components due to improper operation. For instance, when passing items, it is necessary to ensure that the size and shape of the items do not affect the closing and sealing of the door and avoid forcing the door to close, which may cause the sealing rubber strip to deform or be damaged.
Regular maintenance: Regular maintenance and care of the transfer window is an important measure to maintain its airtightness. Regularly check the condition of the sealing rubber strips. If any signs of aging, deformation, or damage are found, they should be replaced promptly. At the same time, inspect and lubricate the door hinges, door locks, and other components of the transfer window to ensure that the door can close and seal normally.
Environmental control: Keep the surrounding environment of the transfer window clean and dry to prevent dust, debris, etc. from entering the sealing part of the transfer window and affecting the sealing effect. At the same time, it is necessary to control the environmental temperature and humidity within an appropriate range to avoid deformation or aging of the sealing materials due to drastic changes in temperature and humidity.