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

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