Efficient use of high-temperature separator filter design, corrugated partitions can be accurately maintained pleat spacing, at minimum resistance, the maximum use of filter media, pleated filter medium on both sides of 180 turned pleated folds, filter prescribe indentation when bending to open into the end of the spacer wedge cassette folds, wedge-shaped box pleated filter layer to prevent breakage. High temperature resistant glass fiber filter; stainless steel frame, aluminum frame; Sealant: high temperature resistant silicone; Gasket: silicone rubber; by laser counting efficiency: 99.99% @ 0.3um efficiency class: H13; continuous high temperature HEPA filter operating temperature of 300 degrees, the maximum temperature can reach 350 degrees.