1, Midium efficiency 2, ISO 9001-2000,CE,EN779 Certification, 3, washable,replaceable filtering material, 4,F5-F9 Product Character: 1, ... 2, Material: chemical material and class fiber material, 3, Efficiency: F5-F9.4, Usage: commonly-used traditional products with best ... would like to manufacture accordingto client's requirement dimensions. F5 aluminum frame polyester bag filter for air-conditioning