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Flame Retardant Pre Filter Media. Silicone Free Material: Made from pure flame retardant polyester fiber without silicone additives. Washable and Reusable: Designed for long service life with high dust holding capacity. Multi-Grade Filtration: Available in G2, G3, and G4 filtration classes for coarse dust removal. Customizable Specifications: Thickness, size, and weight can be customized according to requirements. Flexible Customization Options: Supports full, minor, sample-based, and design-based customization. Low Final Resistance: Maintains efficient airflow with final resistance ranging from 200 to 250 Pa.