... service life, water resistance.Specifications: 1.Type: combined HEPA filter 2.Frame: galvanized steel frame, aluminium frame, plastic frame3. ... Separator: hot melt adhesive4.Medium: PP filter paper,glass fiber filter paper 5.Average arrestance: 85%-99.99% ... F7-H13galvanized steel frame,aluminium frame,plastic framePP filter paper,glass fiber filter paper hot melt adhesive592*490*2923000292*592* ...