High efficiency filter, medium efficiency filter, primary efficiency filter. How can different filters be used together?

High efficiency filter Medium efficiency filter Primary efficiency filter How to use different filters together

A filter at the end of the entire filtration system determines the cleanliness of the entire filtration system. In particular, high efficiency filters and ultra high efficiency filters are equipped with medium efficiency filters and primary efficiency filters in front of them, which can form a step by step protection effect between their various filters. They each protect their more efficient filters in the downwind direction, playing a role in extending their service life.

According to the needs of the operating environment for the cleanliness of the air supply, a corresponding protective filter is added in front of the end filter equipment for pre filtration. If this level of prefilter also requires protection, add a filter at its windward end for prefiltration protection. If one or more pre filtration devices are installed, the efficiency difference between the two adjacent filtration devices should not be too large. For example, do not install primary efficiency air filters to protect high efficiency air filters or even ultra high efficiency air filters. If the difference is too large, the former stage cannot protect the latter stage

How should adjacent different filters be used together? What is the appropriate gap?

When classified according to the European standard "G-F-H-U" efficiency specification, a filter is generally installed every 2-4 gears. For example: G4 → F8 → H14. The terminal H14 high-efficiency filter determines the cleanliness level of the air supply, F8 protects H14, G4 protects F8, and so on

Of course, the specific situation needs to be determined. Comprehensive evaluation should also be conducted based on factors such as industry, on-site environment, and cost performance. Clean room end high efficiency (HEPA) filters should be protected by filters with an efficiency specification of no less than F 8; Filter F9~H11 can be selected before ultra high efficiency (ULPA) filter. The air conditioning system itself should be protected by a filter with an efficiency specification not lower than F5. In areas without wind, sand, and low pollution, pre filters may not be installed in front of F7 filters; In urban air conditioning systems, the common primary filters currently are G3 to F6.