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G3 G4 G5 G6 High Humidity Resistance HEPA Panel Air Filter. Customizable Dimensions: Dimensions (L*W*H) are fully customized to meet specific project requirements. High Humidity Resistance: Designed to operate in environments with up to 100% relative humidity. Moisture-Proof Frame: Features a double-layer moisture-proof cardboard frame for structural reliability. High Dust Tolerance: Special high-fold design provides large dust capacity and low resistance. UL900 Certified: Certified for low resistance, high dust tolerance, and easy installation. Wide Filtration Efficiency: Available in G3, G4, and M5 efficiency grades according to EN779 standards. Durable Materials: Constructed with stainless steel faceguard and galvanized steel brackets.