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Flame Retardant Ceiling Filter. Flame Retardant Performance: Meets S2 fire resistance level (DIN5510-2) for strict fire protection requirements. Customization Options: Offers full, minor, and flexible customization from samples or designs. High Dust Holding Capacity: Up to 600g/m2 dust holding capacity ensures long service life. Low Initial Resistance: Features low initial resistance with strong elasticity and wrinkle resistance. Silicone Free Material: Made from flame retardant polyester fiber (PET) without silicone. Stable Airflow Structure: Uniform air permeability enables uniform diffusion of airflow. OEM and ODM Services: Available OEM and ODM services with 1 R&D engineer support.