The bag-in-bag-out filtration method currently in use in China is still rather limited. However, based on its own characteristics and the long-term application experience abroad, it is certain that it will have a wider and wider application scope in China in the future.
The bag-in-bag-out filtration equipment also provides us with an idea. For a general filtration unit, combined with a certain replacement method and integrating a set of inspection system, it forms a brand-new universal equipment with more reasonable functions, easier operation, and a safer system.
The traditional high-efficiency filtration vents, after installation and use, basically cannot be inspected again. However, the high-efficiency filtration boxes, due to the limitations of the testing methods, need to have a sufficient duct length between the exhaust vent to conduct effective inspections. Such a practice obviously poses safety hazards and does not meet the requirements of the "General Requirements for Laboratory Biosafety". In the standard equipment of bag-in-bag-out filtration, automatic (manual) scanning inspection units are set up, which can inspect the power and safety of the filter at any time. The inspection unit is adjacent to the filter surface formed by the filter and its structure, and a sampling device is set 1 inch (25 mm) away from the filter surface. This sampling device will move in a snake-like pattern along the entire filter surface, with a maximum moving speed of 10 fpm (50 mm/s). This enables us to inspect the filter surface and sealing area of the filtration equipment at any time and according to the application requirements, ensuring the sealing and safety of all inspection sections. The entire inspection equipment is also closed in the box with PVC bags, and the sampling and analysis equipment is connected to the outside of the box through quick connectors, and all sampling ports are equipped with small HEPA filters, ensuring the sealing and safety of all inspection sections.
Experimental results show that this inspection method can imitate and replace the traditional aerosol inspection method, and it has significant advantages compared to the traditional method. It can save the 10 times the pipe diameter length of the mixed flow section duct required by the traditional method upstream and downstream of the filter, ensuring that the filtration equipment is close to the exhaust vent, improving the safety of the entire system, and saving a large amount of duct installation space.
Aire-Plus Technology Official Website：www.aireplus.com.cn
