China F9 Mini-Pleated Air Filter - EN779 Certified, Suppliers & Factory Direct, Efficient Up to 95%@0.4µm

Mainly used in central air conditioning and integrated air supply systems, it can be employed for primary and intermediate filtration in air conditioning systems to protect the HEPA filters and the system.

These materials should effectively capture dust particles without imposing excessive resistance to airflow. A chaotic network of fibers creates numerous barriers to particles, while the wide spaces between fibers allow air to pass through smoothly.

Commonly used materials include glass fiber, synthetic fiber, polypropylene fiber, polyester fiber, and plant fiber. Generally, Mini-pleated Medium filters use glass fiber.

The efficiency of currently available medium-efficiency filters ranges from 65% to 95%, and they can be selected based on specific requirements. The rational selection of filter efficiency and face velocity contributes to comprehensive economic benefits.

For filters made of the same material, higher efficiency typically results in greater resistance and higher cost, while lower efficiency leads to reduced resistance and cost. Altering the air velocity will also affect resistance, efficiency, and the number of filters required, so appropriate selection should be made according to specific conditions.

As dust accumulates on the filter media, the resistance increases. When the resistance reaches an unreasonable level, the filter must be discarded. Sometimes, excessive resistance can cause previously captured dust to become dislodged and re-enter the airflow; when this risk arises, the filter should also be replaced.

The resistance of a filter increases with higher airflow rates. By increasing the surface area of the filter media, the relative velocity of air passing through the filter can be reduced, thereby decreasing the resistance.