用途：空气过滤系统预过滤过滤级别：G3，G4，F5阻燃标准：F1滤料：由合成纤维与微纤维构成，呈递增结构，过滤效果好Purpose：pre-filter through air filter programClass:G3,G4,F5Non-flammability:F1Material:constructed of synthetic fiber and micro-fibril,gradual structure, fine filter effect