Customized Deep Pleated HEPA Filter Aluminum Frame For Food Industry YAYE Customized Deep Pleated HEPA Filter Aluminum Frame For Food Industry. Small in size and light in weight, used in ventilation systems. YAYE Aluminum Alloy Frame HEPA Air Filter Size 610*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