HEPA Filter with Separators: 1. fiberglass paper, EVA hot-melt adhesive. 2. H13, H14 3. galvanized steel frame HEPA Filter with Separators:It is made of ultra thin fiberglass paper and pp media separated by EVA hot-melt adhesive. Aluminum or galvanized iron frame. Small and light, well-sealed, low cost, catch 0.3um or above. HEPA Filter with Separators