G1 G2 G3 G4 Coarse Filter Cotton

Coarse Filter Cotton are widely used in Residential/Commercial HVAC Systems: Installed at AC return air vents or fresh air intakes to protect evaporators and fan coil units.

Clean rooms/ Dust-free Workshops: Serves as primary filtration to protect downstream HEPA filters.

Industrial Manufacturing: Used for pre-filtration in painting booths, food processing plants, pharmaceutical factories, etc Building Fresh Air Systems: Filters large particulate pollutants from outdoor air entering the space.

Air Purifiers: Acts as the first-stage filter.

Automotive: The primary filtration layer in car cabin air filters.

Animal Husbandry: Used in ventilation systems for farms to filter feathers, dust, etc.

Low Resistance, High Airflow: Its loose structure and good breath ability offer minimal obstruction to airflow, ensuring adequate ventilation.

High Dust Holding Capacity: The fluffy and randomly interlaced fiber structure provides ample storage space for captured dust, thus extending the replacement cycle.

Low Cost: As a disposable consumable, it is very inexpensive with low replacement costs.

High Strength, Resistant to Tearing: High-quality primary filter cotton possesses considerable mechanical strength, making it less prone to damage during installation or under air pressure.

Eco-friendly and Easy to Replace: Typically employs pure physical filtration; the material itself is odorless and does not generate new pollutants. Replacement is convenient.

Washable (Certain Types): Some types of primary filter cotton (e.g., synthetic fiber) can be washed and reused. However, filtration efficiency decreases after washing, and the number of wash cycles is limited.

The efficiency of currently available ranges from 40% to 90%, and they can be selected based on specific requirements. The rational selection of filter efficiency and face velocity contributes to comprehensive economic benefits.

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.