Widely used in commercial and industrial HVAC systems to protect the heat transfer coils from becoming coated with dust and lint.
| Description | Case Quantity |
| 10x20x1 | 1 |
| 12x24x1 | 1 |
| 15x20x1 | 1 |
| 16x20x1 | 1 |
| 16x25x1 | 1 |
| 20x20x1 | 1 |
| 20x24x1 | 1 |
| 20x25x1 | 1 |
| 24x24x1 | 1 |
| 10x20x2 | 1 |
| 12x24x2 | 1 |
| 15x20x2 | 1 |
| 16x20x2 | 1 |
| 16x25x2 | 1 |
| 20x20x2 | 1 |
| 20x24x2 | 1 |
| 20x25x2 | 1 |
| 24x24x2 | 1 |