Actual Sizes Chart
Filter dimensions are listed in nominal inches (rounded up for convenience). Because every filter must slide freely into its slot, its actual size is slightly smaller. Our table below lists both numbers so you can match what you measure at home to the correct replacement size.
| Nominal Size | Actual Size |
| 10x20x1 |
9.5 x 19.5 x 0.75
|
| 10x20x2 |
9.5 x 19.5 x 1.75
|
| 12x12x1 |
11.5 x 11.5 x 0.75
|
| 12x20x1 |
11.5 x 19.5 x 0.75
|
| 12x24x1 |
11.5 x 23.5 x 0.75
|
| 12x24x2 |
11.5 x 23.5 x 1.75
|
| 12x24x4 |
11.5 x 23.5 x 3.75
|
| 14x20x1 |
13.5 x 19.5 x 0.75
|
| 14x20x2 |
13.5 x 19.5 x 1.75
|
| 14x25x1 |
13.5 x 24.5 x 0.75
|
| 14x25x2 |
13.5 x 24.5 x 1.75
|
| 15x20x1 |
14.5 x 19.5 x 0.75
|
| 15x20x2 |
14.5 x 19.5 x 1.75
|
| 16x16x1 |
15.5 x 15.5 x 0.75
|
| 16x16x2 |
15.5 x 15.5 x 1.75
|
| 16x20x1 |
15.5 x 19.5 x 0.75
|
| 16x20x2 |
15.5 x 19.5 x 1.75
|
| 16x20x4 |
15.5 x 19.5 x 3.75
|
| 16x20x5 |
15.5 x 19.5 x 4.75
|
| 16x24x1 |
15.5 x 23.5 x 0.75
|
| 16x24x2 |
15.5 x 23.5 x 1.75
|
| 16x24x4 |
15.5 x 23.5 x 3.75
|
| 16x25x1 |
15.5 x 24.5 x 0.75
|
| 16x25x2 |
15.5 x 24.5 x 1.75
|
| 16x25x4 |
15.5 x 24.5 x 3.75
|
| 16x25x5 |
15.5 x 24.5 x 4.75
|
| 18x18x2 |
17.5 x 17.5 x 1.75
|
| 18x20x1 |
17.5 x 19.5 x 0.75
|
| 18x20x2 |
17.5 x 19.5 x 1.75
|
| 18x24x1 |
17.5 x 23.5 x 0.75
|
| 18x24x2 |
17.5 x 23.5 x 1.75
|
| 18x24x4 |
17.5 x 23.5 x 3.75
|
| 18x25x2 |
17.5 x 24.5 x 1.75
|
| 20x20x1 |
19.5 x 19.5 x 0.75
|
| 20x20x2 |
19.5 x 19.5 x 1.75
|
| 20x20x4 |
19.5 x 19.5 x 3.75
|
| 20x20x5 |
19.5 x 19.5 x 4.75
|
| 20x22x1 |
19.5 x 21.5 x 0.75
|
| 20x24x1 |
19.5 x 23.5 x 0.75
|
| 20x24x2 |
19.5 x 23.5 x 1.75
|
| 20x24x4 |
19.5 x 23.5 x 3.75
|
| 20x25x1 |
19.5 x 24.5 x 0.75
|
| 20x25x2 |
19.5 x 24.5 x 1.75
|
| 20x25x4 |
19.5 x 24.5 x 3.75
|
| 20x25x5 |
19.5 x 24.5 x 4.75
|
| 24x24x1 |
23.5 x 23.5 x 0.75
|
| 24x24x2 |
23.5 x 23.5 x 1.75
|
| 24x24x4 |
23.5 x 23.5 x 3.75
|
| 24x24x5 |
23.5 x 23.5 x 4.75
|