304 Stainless Steel Frame High-Efficiency Air Filter, Equipped With Aluminum Foil Separator. Customizable. Product Description YAYE Aluminum Alloy Frame HEPA Air Filter Size 1220*610*150mm 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-shaped" support grooves. The frames