Deep Pleat H10 - H14 Grade Aluminum Frame High-Efficiency Air Filter, Suitable For Clean Rooms Small in size and light in weight, used in ventilation systems. YAYE Aluminum Alloy Frame HEPA Air Filter Size 610*610*292mm Or Customized. The main type uses aluminum foil partitions (thickness ranging from 0.03 to 0.05 mm), while some low-cost models use paper partitions. The surface of the aluminum foil partitions is processed by corrugated pressing, forming "V-shaped" or "U