G4 EN779 Standard Pre Filter Media Roll with High Dust Holding Capacity and Low Air Resistance for HVAC Systems

Our blue and white pre-filter is a classic G4 grade coarse filter material, widely used as the first stage of filtration in air filtration systems. Made from gradient-density polyester fibers, it acts as the first barrier, effectively intercepting large particles of dust, lint, hair, and fine impurities, thus protecting subsequent medium and high-efficiency filters and extending their lifespan.

This filter cartridge features a layered gradient design: a high-density blue fiber layer on the inlet side and a low-density white fiber layer on the outlet side. Dust is trapped layer by layer within the fibers, rather than simply adhering to the surface. Compared to single-color filter cotton, it can hold more dust and maintains stable low air resistance during long-term operation.

Complies with the European EN779 G4 pre-filtration standard, effectively intercepting coarse particulate contaminants and reducing the burden on subsequent HEPA filters, bag filters, and ceiling filters.

The progressive density gradient structure maximizes dust holding capacity, reducing replacement frequency and lowering long-term operating costs.

Slight airflow pressure drop ensures efficient operation of the ventilation system without additional energy consumption.

Flexible, tear-resistant, and lint-free fibers prevent fiber debris from contaminating clean air. Optional flame-retardant formulations are available for high-risk workshops.

A variety of sizes are available, including large rolls of pre-cut sheets and framed filter pads, to meet your size requirements. Custom widths, thicknesses, and lengths are supported.

Suitable for primary filtration in dozens of industries, meeting your various application scenarios:

• Pre-filtering of air intakes in paint booths; can be used with ceiling filter cotton
• HVAC ventilation systems, factory workshop ventilation outlets, and equipment air inlets
• Cleanrooms, laboratories, and hospital air handling units
• Server rooms, subway ventilation, and air circulation in aviation facilities
• Industrial painting workshops and dust control in machinery manufacturing
• Air purifiers and initial filter replacement for central air conditioning systems

For optimal dust storage and filtration performance, please ensure the blue side faces the air inlet and the white side faces the clean air outlet. In environments with high dust concentrations, please regularly check and replace the filter cotton to maintain ventilation efficiency.

We provide bulk wholesale services to filter distributors, ventilation contractors, and paint booth factories worldwide. Please provide your dimensions and specifications to receive highly competitive wholesale prices and free samples.