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 $69.95 $87.95
12 x 24 13 x 25 14.75 by 26.75 62 $139.95 $175.95
12 x 36 13 x 37 14.75 x 38.75 95 $209.95 $263.95
14 x 14 15 x 15 16.75 x 16.75 39 $95.95 $119.95
14 x 20 15 x 21 16.75 x 22.75 59 $135.95 $171.95
14 x 25 15 x 26 16.75 x 27.75 78 $169.95 $213.95
14 x 30 15 x 31 16.75 x 32.75 93 $203.95 $255.95
16 x 16 17 x 17 18.75 X 18.75 57 $123.95 $155.95
16 x 20 17 x 21 18.75 x 22.75 68 $155.95 $195.95
16 x 25 17 x 26 18.75 x 27.75 90 $193.95 $243.95
18 x 18 19 x 19 20.75 x 20.75 70 $157.95 $197.95
20 x 20 21 x 21 22.75 x 22.75 86 $193.95 $243.95
20 x 25 21 x 26 22.75 x 27.75 114 $243.95 $303.95
20 x 30 21 x 31 22.75 x 32.75 136 $291.95 $365.95
24 x 12 25 x 13 26.75 x 14.75 61 $139.95 $175.95
24 x 24 25 x 25 26.75 x 26.75 130 $279.95 $349.95
24 x 36 25 x 37 26.75 x 38.75 199 $419.95 $525.95
25 x 20 26 x 21 27.75 x 22.75 108 $243.95 $303.95
30 x 20 31 x 21 32.75 x 22.75 131 $291.95 $365.95

custom sizes:
68 cents per square inch of duct opening in paint grade
80 cents per square inch of duct opening in red oak

s&h: 8%, but at least $14.95

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