| filter size | rough opening | overall dims | free area (sq in) | price in paint grade | price in red oak |
|---|---|---|---|---|---|
| 12 x 12 | 13 x 13 | 14.75 x 14.75 | 30 | $72.95 | $91.95 |
| 12 x 24 | 13 x 25 | 14.75 by 26.75 | 62 | $146.95 | $184.95 |
| 12 x 36 | 13 x 37 | 14.75 x 38.75 | 95 | $219.95 | $276.95 |
| 14 x 14 | 15 x 15 | 16.75 x 16.75 | 39 | $99.95 | $125.95 |
| 14 x 20 | 15 x 21 | 16.75 x 22.75 | 59 | $142.95 | $180.95 |
| 14 x 25 | 15 x 26 | 16.75 x 27.75 | 78 | $178.95 | $224.95 |
| 14 x 30 | 15 x 31 | 16.75 x 32.75 | 93 | $213.95 | $268.95 |
| 16 x 16 | 17 x 17 | 18.75 X 18.75 | 57 | $129.95 | $163.95 |
| 16 x 20 | 17 x 21 | 18.75 x 22.75 | 68 | $163.95 | $205.95 |
| 16 x 25 | 17 x 26 | 18.75 x 27.75 | 90 | $203.95 | $255.95 |
| 18 x 18 | 19 x 19 | 20.75 x 20.75 | 70 | $165.95 | $207.95 |
| 20 x 20 | 21 x 21 | 22.75 x 22.75 | 86 | $203.95 | $255.95 |
| 20 x 25 | 21 x 26 | 22.75 x 27.75 | 114 | $255.95 | $318.95 |
| 20 x 30 | 21 x 31 | 22.75 x 32.75 | 136 | $306.95 | $383.95 |
| 24 x 12 | 25 x 13 | 26.75 x 14.75 | 61 | $146.95 | $184.95 |
| 24 x 24 | 25 x 25 | 26.75 x 26.75 | 130 | $293.95 | $367.95 |
| 24 x 36 | 25 x 37 | 26.75 x 38.75 | 199 | $440.95 | $551.95 |
| 25 x 20 | 26 x 21 | 27.75 x 22.75 | 108 | $255.95 | $318.95 |
| 30 x 20 | 31 x 21 | 32.75 x 22.75 | 131 | $306.95 | $383.95 |
custom sizes:
80 cents per square inch of duct opening in paint grade
one dollar per square inch of duct opening in red oak
s&h: 8%, but at least $19.95
