When selecting a medium efficiency filter, how do I evaluate its dust holding capacity and filtration efficiency?

When selecting a medium efficiency filter, the following aspects usually need to be considered when evaluating its dust holding capacity and filtration efficiency:

1. filtration efficiency: This is a key indicator of filter performance and refers to the percentage of contaminants that the filter is able to filter out. The filtration efficiency of medium efficiency filters is usually expressed as a percentage, for example, the filtration efficiency of F5 grade filters is in the range of 40%-60%, while that of F9 grade is in the range of 95% and above.
2. dust capacity: The total weight in grams (g) of artificial dust captured by a filter when it reaches final resistance at rated airflow. The larger the dust capacity, the more dust the filter can hold, thus extending the service life of the filter.
3. Filter resistanceThe final resistance is usually set at two times the initial resistance or recommended by the manufacturer. The final resistance is usually set as 2 times of the initial resistance or recommended by the manufacturer, after the final resistance value is determined, the dust holding capacity is closely related to the final resistance value.
4. Filter areaThe larger the filtration area, the greater the dust holding capacity, the lower the rate of airflow through the material, the lower the wind resistance, and the longer the filter lasts.
5. Filter structure: The structural form of the filter, such as bag, frame, combination, etc., affects the dust holding capacity and filtration efficiency. For example, bag filters usually have a larger windward surface and dust capacity due to their structural characteristics.
6. Filter materials: The type and quality of the filter media also affects the dust holding capacity and filtration efficiency. Commonly used filter media are synthetic fibers, glass fibers, non-woven fabrics and so on.
7. Test Standards: Different countries and regions have different testing and classification standards, such as the European standard EN779, the American standard ASHRAE 52.2, etc. These standards provide the basis for filter performance evaluation.
8. application scenario: According to the specific requirements of the use environment, such as hospitals, laboratories, food processing plants, etc., select the appropriate filtration efficiency and dust capacity of the filter.
9. Maintenance and replacement: Considering the maintenance costs and replacement intervals of filters, higher capacity filters may mean longer replacement intervals and lower maintenance costs.

By taking these factors into consideration, the most appropriate medium efficiency filter for a particular application can be selected.