Pre-Filters

Pre-filters serve as the first stage of multi-stage air filtration systems, classified under EN 779 from G1 to F7, corresponding to the ePM10 range of ISO 16890. Their primary function is to capture large particles of 5μm or larger — including construction dust, pollen, hair, and fiber debris — thereby reducing the dust load on downstream medium and high-efficiency filters, extending their service life and lowering overall system pressure drop.

Three main structural types are commonly used: Panel Type with cardboard or metal frames paired with non-woven or synthetic fiber media, suited for high-airflow, low-pressure-drop applications; Bag Type with multiple filter bags offering large dust-holding capacity and extended replacement cycles; Pleated Type using folded media to maximize filtration area while minimizing installation depth. Frame materials include cardboard, aluminum, galvanized steel, and stainless steel, selected based on environmental humidity, fire rating, and service life requirements.

Typical applications include fresh air intake for semiconductor fabs, AHU pre-filtration for display panel plants, first-stage filtration in cleanrooms, general ventilation in healthcare facilities, and HVAC systems in commercial and industrial buildings.