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Frame Paperboard Frame、Aluminum Frame、Galvanized Steel Frame、Stainless Steel Frame Frame Profile Thickness 22mm、25mm、46mm、96mm etc. Filter Media PET-PP Composite Media Max. Operating Temperature ≥80°C Moisture-Resistant Media ≥100% Efficiency Rating CLASS EN779 G4 5μ Nominal Dimensions Nominal Size: 24″x24″x6″ 595X595X46mm（Millimeter） Rated Airflow Capacity 3400 m3/h Initial Pressure Drop 60Pa Note:
Why Filter Efficiency Matters In commercial HVAC systems, primary filters serve as the first line of defense, capturing 85%+ of airborne particulates above 5μm. Our ISO 16890-certified testing demonstrates how G3/G4 filter selection impacts operational efficiency and maintenance costs. 1. Understanding Efficiency Classifications 1.1 ASHRAE vs. ISO Testing Methods
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