What Do Filter Classes G, F, H, And U Represent?

1.Class G (Primary Efficiency Filter)

Filtration Efficiency: Mainly used to filter particles larger than 5μm. For example, the filtration efficiency of Class G4 is approximately 40%.

Application Scenarios: Suitable for primary filtration in air conditioning systems, such as pre-filtration for central air conditioners and industrial ventilation systems. It features low cost and low resistance.

Product Types: Including panel-type, pleated-type, and bag-type filters. Materials used include non-woven fabrics and metal meshes.

2. Class F (Medium Efficiency Filter)

Filtration Efficiency: Targets particles of 1-5μm, with an efficiency ranging from 60% to 95% (colorimetry method).

Application Scenarios: Used for medium-level filtration in industries such as electronics and pharmaceuticals, or as pre-protection for high-efficiency filters to extend their service life.

Product Types: Available in bag-type or non-bag-type structures (e.g., Classes F5-F9). Materials include glass fibers or special non-woven fabrics.

3. Class H (High Efficiency Filter)

Filtration Efficiency: The filtration efficiency for 0.3μm particles is as high as 99.999% (DOP method). For instance, Class H13 is often used in household HEPA filters.

Application Scenarios: Used in high-cleanliness environments such as cleanrooms, bioengineering facilities, and medical settings, serving as the final-stage filtration in air purification systems.

Product Types: Includes designs with and without partitions, using ultra-fine glass fiber filter media.

4. Class U (Ultra-High Efficiency Filter)

Filtration Efficiency: Higher than that of Class H. It is usually used to capture particles smaller than 0.1μm and is suitable for extreme cleanliness environments such as semiconductor manufacturing and ultra-clean laboratories.

Features: Due to its extremely high filtration efficiency, it may be accompanied by greater resistance and energy consumption, so the application scenario needs to be comprehensively considered.

Product Advantages of Gezi Filtech Manufacturing Co., Ltd.

Product Coverage: GEZI produces a full range of filters, including primary efficiency (Class G), medium efficiency (Class F), high efficiency (Class H) filters, and HEPA filters (e.g., Class H13). It also manufactures supporting sheet metal frames and activated carbon filters.

Technical Strength: Possesses a patent for pleated medium efficiency filters, optimizing the filtration area and maintainability.

Application Fields: The products are widely used in clean workshops, fresh air systems, medical electronics, and other industries, complying with the concepts of "energy conservation, low carbon, and environmental protection".

Selection Recommendations

Balance Efficiency and Energy Consumption: The higher the class, the greater the resistance. Selection should be based on actual needs to avoid excessive pursuit of high efficiency leading to increased energy consumption.

Multi-Stage Filtration System: It is recommended to adopt a stepped combination of G→F→H to optimize the filtration effect and extend the service life of high-efficiency filters.

For specific product parameters or customized solutions, please refer to Gezi Filtech Manufacturing Co., Ltd. or contact its technical support team.