The number of filter units in the bag-in-bag-out filter determines the combination method. The number of filter units arranged in the horizontal direction is called W, and the number of filter units arranged in the height direction is H. If a bag enters the bag and exits the filter For the 2H2W type, it means that there are 2 groups of filter units in the horizontal and height directions, and there are 4 groups of filter units in the box. At the same time, the number of filter units also determines the air volume of the bag in and out of the filter. Taking the most frequently used 24-inch × 24-inch (610mm × 610 mm) HEPA as an example, the filter air volume is 1700 m3/h under the resistance of 250 Pa., then the above-mentioned 2H2W filter air volume is 6800 m3/h. When the filter unit is combined, the number of filter units in the horizontal direction is limited. For example, the filter units of 610 mm × 610 mm can only be arranged in three groups (3W) at most, so as to ensure that the operator can smoothly replace the deepest one. There are generally no specific restrictions in the height direction, which can be determined according to the actual situation on site.
The biggest feature of the bag-in-bag-out filter is that the installation, replacement, and detection of the filter are all carried out under the protection of the PVC bag (or high-temperature bag). The filter unit does not come into contact with the outside air at all, thus ensuring the safety of personnel and the environment, making The replacement process quick and easy.
The biggest feature of the bag-in-bag-out filter is that the installation, replacement, and detection of the filter are all carried out under the protection of the PVC bag (or high-temperature bag), and the filter unit does not come into contact with the outside air at all, thus ensuring the safety of personnel and the environment. The process is convenient and quick.
A significant feature of bag-in-bag-out is its detectability. The traditional high-efficiency filter air outlet cannot be tested again after installation and use, and the high-efficiency filter box must have enough space between the air outlet due to the limitation of the test method. Only the length of the air duct can be effectively detected, which obviously constitutes a potential safety hazard and does not meet the requirements of the "General Requirements for Laboratory Biosafety" (GB 19489-2007).
In the standard bag-in-bag-out filter, an automatic (manual) scanning detection unit is set up, which can check the efficiency and safety of the filter at any time.
The detection unit is adjacent to the filter surface consisting of the filter and its frame, and a sampling device is located 1 inch (25 mm) away from the filter surface. The sampling device will make a serpentine motion along the entire filter surface at a maximum speed of 10 fpm ( 50 mm/s) so that the filter surface and sealing area of the filter equipment can be inspected at any time or according to the requirements of use. The entire inspection device is also enclosed in the box with a PVC bag, and the sampling and analysis devices are connected to the box through quick connectors. In addition, all sampling ports are equipped with small HEPA, which also ensures the sealing and safety of the entire detection section.
It has been proved by experiments that this detection method can completely simulate and replace the traditional aerosol detection method. Compared with the traditional method, it has obvious advantages and can save 10 times the pipe diameter length upstream and downstream of the filter required by the traditional method. The mixed-flow section air duct can ensure that the filter equipment is as close to the air outlet as possible, improve the safety of the entire system, and save a lot of air duct installation space.
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