Permanent metals frames designed to contain replaceable filter media pads. When loaded with dirt they are easily replaced
| Description | Case Quantity |
| 12x24x1 | 1 |
| 16x20x1 | 1 |
| 16x25x1 | 1 |
| 20x20x1 | 1 |
| 20x25x1 | 1 |
| 24x24x1 | 1 |
| 12x24x2 | 1 |
| 16x20x2 | 1 |
| 16x25x2 | 1 |
| 20x20x2 | 1 |
| 20x24x2 | 1 |
| 20x25x2 | 1 |
| 24x24x2 | 1 |