Callout SizeOutside DimensionsRough Opening
(minimum-maximum)
Free Air
WidthHeightWidthHeightSF% free
08x109.25''11.25''6.75'' - 8.5''8.75'' - 10.5''0.29653.2%
08x129.25''13.25''6.75'' - 8.5''10.75'' - 12.5''0.36755.0%
08x149.25''15.25''6.75'' - 8.5''12.75'' - 14.5''0.43856.3%
08x169.25''17.25''6.75'' - 8.5''14.75'' - 16.5''0.50957.3%
08x189.25''19.25''6.75'' - 8.5''16.75'' - 18.5''0.58058.0%
08x209.25''21.25''6.75'' - 8.5''18.75'' - 20.5''0.65158.6%
08x229.25''23.25''6.75'' - 8.5''20.75'' - 22.5''0.72359.1%
08x249.25''25.25''6.75'' - 8.5''22.75'' - 24.5''0.79459.5%
08x259.25''26.25''6.75'' - 8.5''23.75'' - 25.5''0.82959.7%
08x269.25''27.25''6.75'' - 8.5''24.75'' - 26.5''0.86559.9%
8x289.25''29.25''6.75'' - 8.5''26.75'' - 28.5''0.93660.2%
08x309.25''31.25''6.75'' - 8.5''28.75'' - 30.5''1.00760.4%
08x329.25''33.25''6.75'' - 8.5''30.75'' - 32.5''1.07960.7%
08x349.25''35.25''6.75'' - 8.5''32.75'' - 34.5''1.15060.9%
08x369.25''37.25''6.75'' - 8.5''34.75'' - 36.5''1.22161.0%
10x0811.25''9.25''8.75'' - 10.5''6.75'' - 8.5''0.29052.3%
10x1011.25''11.25''8.75'' - 10.5''8.75'' - 10.5''0.38255.1%
10x1211.25''13.25''8.75'' - 10.5''10.75'' - 12.5''0.47456.9%
10x1411.25''15.25''8.75'' - 10.5''12.75'' - 14.5''0.56658.3%
10x1611.25''17.25''8.75'' - 10.5''14.75'' - 16.5''0.65859.3%
10x1811.25''19.25''8.75'' - 10.5''16.75'' - 18.5''0.75060.0%
10x2011.25''21.25''8.75'' - 10.5''18.75'' - 20.5''0.84260.7%
10x2211.25''23.25''8.75'' - 10.5''20.75'' - 22.5''0.93461.2%
10x2411.25''25.25''8.75'' - 10.5''22.75'' - 24.5''1.02661.6%
10x2511.25''26.25''8.75'' - 10.5''23.75'' - 25.5''1.07261.8%
10x2611.25''27.25''8.75'' - 10.5''24.75'' - 26.5''1.11861.9%
10x2811.25''29.25''8.75'' - 10.5''26.75'' - 28.5''1.21162.3%
10x3011.25''31.25''8.75'' - 10.5''28.75'' - 30.5''1.30362.5%
10x3211.25''33.25''8.75'' - 10.5''30.75'' - 32.5''1.39562.8%
10x3411.25''35.25''8.75'' - 10.5''32.75'' - 34.5''1.48763.0%
10x3611.25''37.25''8.75'' - 10.5''34.75'' - 36.5''1.57963.1%
12x0813.25''9.25''10.75'' - 12.5''6.75'' - 8.5''0.35653.5%
12x1013.25''11.25''10.75'' - 12.5''8.75'' - 10.5''0.46956.3%
12x1213.25''13.25''10.75'' - 12.5''10.75'' - 12.5''0.58258.2%
12x1413.25''15.25''10.75'' - 12.5''12.75'' - 14.5''0.69559.6%
12x1613.25''17.25''10.75'' - 12.5''14.75'' - 16.5''0.80860.6%
12x1813.25''19.25''10.75'' - 12.5''16.75'' - 18.5''0.92161.4%
12x2013.25''21.25''10.75'' - 12.5''18.75'' - 20.5''1.03362.0%
12x2213.25''23.25''10.75'' - 12.5''20.75'' - 22.5''1.14662.5%
12x2413.25''25.25''10.75'' - 12.5''22.75'' - 24.5''1.25963.0%
12x2513.25''26.25''10.75'' - 12.5''23.75'' - 25.5''1.31663.1%
12x2613.25''27.25''10.75'' - 12.5''24.75'' - 26.5''1.37263.3%
12x2813.25''29.25''10.75'' - 12.5''26.75'' - 28.5''1.48563.6%
12x3013.25''31.25''10.75'' - 12.5''28.75'' - 30.5''1.59863.9%
12x3213.25''33.25''10.75'' - 12.5''30.75'' - 32.5''1.71164.1%
12x3413.25''35.25''10.75'' - 12.5''32.75'' - 34.5''1.82364.4%
12x3613.25''37.25''10.75'' - 12.5''34.75'' - 36.5''1.93664.5%
14x0815.25''9.25''12.75'' - 14.5''6.75'' - 8.5''0.42254.3%
14x1015.25''11.25''12.75'' - 14.5''8.75'' - 10.5''0.55657.2%
14x1215.25''13.25''12.75'' - 14.5''10.75'' - 12.5''0.69059.1%
14x1415.25''15.25''12.75'' - 14.5''12.75'' - 14.5''0.82360.5%
14x1615.25''17.25''12.75'' - 14.5''14.75'' - 16.5''0.95761.5%
14x1815.25''19.25''12.75'' - 14.5''16.75'' - 18.5''1.09162.3%
14x2015.25''21.25''12.75'' - 14.5''18.75'' - 20.5''1.22463.0%
14x2215.25''23.25''12.75'' - 14.5''20.75'' - 22.5''1.35863.5%
14x2415.25''25.25''12.75'' - 14.5''22.75'' - 24.5''1.49263.9%
14x2515.25''26.25''12.75'' - 14.5''23.75'' - 25.5''1.55964.1%
14x2615.25''27.25''12.75'' - 14.5''24.75'' - 26.5''1.62564.3%
14x2815.25''29.25''12.75'' - 14.5''26.75'' - 28.5''1.75964.6%
14x3015.25''31.25''12.75'' - 14.5''28.75'' - 30.5''1.89364.9%
14x3215.25''33.25''12.75'' - 14.5''30.75'' - 32.5''2.02665.1%
14x3415.25''35.25''12.75'' - 14.5''32.75'' - 34.5''2.16065.3%
14x3615.25''37.25''12.75'' - 14.5''34.75'' - 36.5''2.29465.5%
16x0817.25''9.25''14.75'' - 16.5''6.75'' - 8.5''0.48854.9%
16x1017.25''11.25''14.75'' - 16.5''8.75'' - 10.5''0.64357.9%
16x1217.25''13.25''14.75'' - 16.5''10.75'' - 12.5''0.79759.8%
16x1417.25''15.25''14.75'' - 16.5''12.75'' - 14.5''0.95261.2%
16x1617.25''17.25''14.75'' - 16.5''14.75'' - 16.5''1.10662.2%
16x1817.25''19.25''14.75'' - 16.5''16.75'' - 18.5''1.26163.0%
16x2017.25''21.25''14.75'' - 16.5''18.75'' - 20.5''1.41563.7%
16x2217.25''23.25''14.75'' - 16.5''20.75'' - 22.5''1.57064.2%
16x2417.25''25.25''14.75'' - 16.5''22.75'' - 24.5''1.72464.7%
16x2517.25''26.25''14.75'' - 16.5''23.75'' - 25.5''1.80264.9%
16x2617.25''27.25''14.75'' - 16.5''24.75'' - 26.5''1.87965.0%
16x2817.25''29.25''14.75'' - 16.5''26.75'' - 28.5''2.03365.4%
16x3017.25''31.25''14.75'' - 16.5''28.75'' - 30.5''2.18865.6%
16x3217.25''33.25''14.75'' - 16.5''30.75'' - 32.5''2.34265.9%
16x3417.25''35.25''14.75'' - 16.5''32.75'' - 34.5''2.49766.1%
16x3617.25''37.25''14.75'' - 16.5''34.75'' - 36.5''2.65166.3%
18x0819.25''9.25''16.75'' - 18.5''6.75'' - 8.5''0.55455.4%
18x1019.25''11.25''16.75'' - 18.5''8.75'' - 10.5''0.73058.4%
18x1219.25''13.25''16.75'' - 18.5''10.75'' - 12.5''0.90560.3%
18x1419.25''15.25''16.75'' - 18.5''12.75'' - 14.5''1.08061.7%
18x1619.25''17.25''16.75'' - 18.5''14.75'' - 16.5''1.25662.8%
18x1819.25''19.25''16.75'' - 18.5''16.75'' - 18.5''1.43163.6%
18x2019.25''21.25''16.75'' - 18.5''18.75'' - 20.5''1.60664.3%
18x2219.25''23.25''16.75'' - 18.5''20.75'' - 22.5''1.78264.8%
18x2419.25''25.25''16.75'' - 18.5''22.75'' - 24.5''1.95765.2%
18x2519.25''26.25''16.75'' - 18.5''23.75'' - 25.5''2.04565.4%
18x2619.25''27.25''16.75'' - 18.5''24.75'' - 26.5''2.13265.6%
18x2819.25''29.25''16.75'' - 18.5''26.75'' - 28.5''2.30865.9%
18x3019.25''31.25''16.75'' - 18.5''28.75'' - 30.5''2.48366.2%
18x3219.25''33.25''16.75'' - 18.5''30.75'' - 32.5''2.65866.5%
18x3419.25''35.25''16.75'' - 18.5''32.75'' - 34.5''2.83466.7%
18x3619.25''37.25''16.75'' - 18.5''34.75'' - 36.5''3.00966.9%
20x0821.25''9.25''18.75'' - 20.5''6.75'' - 8.5''0.62055.8%
20x1021.25''11.25''18.75'' - 20.5''8.75'' - 10.5''0.81658.8%
20x1221.25''13.25''18.75'' - 20.5''10.75'' - 12.5''1.01360.8%
20x1421.25''15.25''18.75'' - 20.5''12.75'' - 14.5''1.20962.2%
20x1621.25''17.25''18.75'' - 20.5''14.75'' - 16.5''1.40563.2%
20x1821.25''19.25''18.75'' - 20.5''16.75'' - 18.5''1.60164.0%
20x2021.25''21.25''18.75'' - 20.5''18.75'' - 20.5''1.79764.7%
20x2221.25''23.25''18.75'' - 20.5''20.75'' - 22.5''1.99365.2%
20x2421.25''25.25''18.75'' - 20.5''22.75'' - 24.5''2.19065.7%
20x2521.25''26.25''18.75'' - 20.5''23.75'' - 25.5''2.28865.9%
20x2621.25''27.25''18.75'' - 20.5''24.75'' - 26.5''2.38666.1%
20x2821.25''29.25''18.75'' - 20.5''26.75'' - 28.5''2.58266.4%
20x3021.25''31.25''18.75'' - 20.5''28.75'' - 30.5''2.77866.7%
20x3221.25''33.25''18.75'' - 20.5''30.75'' - 32.5''2.97466.9%
20x3421.25''35.25''18.75'' - 20.5''32.75'' - 34.5''3.17167.1%
20x3621.25''37.25''18.75'' - 20.5''34.75'' - 36.5''3.36767.3%
22x0823.25''9.25''20.75'' - 22.5''6.75'' - 8.5''0.68656.1%
22x1023.25''11.25''20.75'' - 22.5''8.75'' - 10.5''0.90359.1%
22x1223.25''13.25''20.75'' - 22.5''10.75'' - 12.5''1.12061.1%
22x1423.25''15.25''20.75'' - 22.5''12.75'' - 14.5''1.33762.5%
22x1623.25''17.25''20.75'' - 22.5''14.75'' - 16.5''1.55463.6%
22x1823.25''19.25''20.75'' - 22.5''16.75'' - 18.5''1.77164.4%
22x2023.25''21.25''20.75'' - 22.5''18.75'' - 20.5''1.98865.1%
22x2223.25''23.25''20.75'' - 22.5''20.75'' - 22.5''2.20565.6%
22x2423.25''25.25''20.75'' - 22.5''22.75'' - 24.5''2.42266.1%
22x2523.25''26.25''20.75'' - 22.5''23.75'' - 25.5''2.53166.3%
22x2623.25''27.25''20.75'' - 22.5''24.75'' - 26.5''2.63966.4%
22x2823.25''29.25''20.75'' - 22.5''26.75'' - 28.5''2.85666.8%
22x3023.25''31.25''20.75'' - 22.5''28.75'' - 30.5''3.07367.1%
22x3223.25''33.25''20.75'' - 22.5''30.75'' - 32.5''3.29067.3%
22x3423.25''35.25''20.75'' - 22.5''32.75'' - 34.5''3.50767.5%
22x3623.25''37.25''20.75'' - 22.5''34.75'' - 36.5''3.72467.7%
24x0825.25''9.25''22.75'' - 24.5''6.75'' - 8.5''0.75256.4%
24x1025.25''11.25''22.75'' - 24.5''8.75'' - 10.5''0.99059.4%
24x1225.25''13.25''22.75'' - 24.5''10.75'' - 12.5''1.22861.4%
24x1425.25''15.25''22.75'' - 24.5''12.75'' - 14.5''1.46662.8%
24x1625.25''17.25''22.75'' - 24.5''14.75'' - 16.5''1.70463.9%
24x1825.25''19.25''22.75'' - 24.5''16.75'' - 18.5''1.94164.7%
24x2025.25''21.25''22.75'' - 24.5''18.75'' - 20.5''2.17965.4%
24x2225.25''23.25''22.75'' - 24.5''20.75'' - 22.5''2.41765.9%
24x2425.25''25.25''22.75'' - 24.5''22.75'' - 24.5''2.65566.4%
24x2625.25''27.25''22.75'' - 24.5''24.75'' - 26.5''2.89366.8%
24x3025.25''31.25''22.75'' - 24.5''28.75'' - 30.5''3.36867.4%
24x3225.25''33.25''22.75'' - 24.5''30.75'' - 32.5''3.60667.6%
24x3425.25''35.25''22.75'' - 24.5''32.75'' - 34.5''3.84467.8%
24x3625.25''37.25''22.75'' - 24.5''34.75'' - 36.5''4.08268.0%
25x0826.25''9.25''23.75'' - 25.5''6.75'' - 8.5''0.78556.5%
25x1026.25''11.25''23.75'' - 25.5''8.75'' - 10.5''1.03359.5%
25x1226.25''13.25''23.75'' - 25.5''10.75'' - 12.5''1.28261.5%
25x1426.25''15.25''23.75'' - 25.5''12.75'' - 14.5''1.53062.9%
25x1626.25''17.25''23.75'' - 25.5''14.75'' - 16.5''1.77864.0%
25x1826.25''19.25''23.75'' - 25.5''16.75'' - 18.5''2.02664.8%
25x2026.25''21.25''23.75'' - 25.5''18.75'' - 20.5''2.27565.5%
25x2226.25''23.25''23.75'' - 25.5''20.75'' - 22.5''2.52366.1%
25x2526.25''26.25''23.75'' - 25.5''23.75'' - 25.5''2.89566.7%
25x2626.25''27.25''23.75'' - 25.5''24.75'' - 26.5''3.02066.9%
25x2826.25''29.25''23.75'' - 25.5''28.75'' - 28.5''3.26867.2%
25x3026.25''31.25''23.75'' - 25.5''28.75'' - 30.5''3.51667.5%
25x3226.25''33.25''23.75'' - 25.5''30.75'' - 32.5''3.76467.8%
25x3426.25''35.25''23.75'' - 25.5''32.75'' - 34.5''4.01368.0%
25x3626.25''37.25''23.75'' - 25.5''34.75'' - 36.5''4.26168.2%
26x0827.25''9.25''24.75'' - 26.5''6.75'' - 8.5''0.81856.6%
26x1027.25''11.25''24.75'' - 26.5''8.75'' - 10.5''1.07759.6%
26x1227.25''13.25''24.75'' - 26.5''10.75'' - 12.5''1.33661.6%
26x1427.25''15.25''24.75'' - 26.5''12.75'' - 14.5''1.59463.1%
26x1627.25''17.25''24.75'' - 26.5''15.75'' - 16.5''1.85364.1%
26x1827.25''19.25''24.75'' - 26.5''16.75'' - 18.5''2.11265.0%
26x2027.25''21.25''24.75'' - 26.5''18.75'' - 20.5''2.37065.6%
26x2227.25''23.25''24.75'' - 26.5''20.75'' - 22.5''2.62966.2%
26x2427.25''25.25''24.75'' - 26.5''22.75'' - 24.5''2.88866.6%
26x2527.25''26.25''24.75'' - 26.5''23.75'' - 25.5''3.01766.8%
26x2627.25''27.25''24.75'' - 26.5''24.75'' - 26.5''3.14667.0%
26x2827.25''29.25''24.75'' - 26.5''26.75'' - 28.5''3.40567.4%
26x3027.25''31.25''24.75'' - 26.5''30.75'' - 30.5''3.66467.6%
26x3227.25''33.25''24.75'' - 26.5''30.75'' - 32.5''3.92267.9%
26x3427.25''35.25''24.75'' - 26.5''32.75'' - 34.5''4.18168.1%
26x3627.25''37.25''24.75'' - 26.5''34.75'' - 36.5''4.44068.3%
28x0829.25''9.25''26.75'' - 28.5''6.75'' - 8.5''0.88456.8%
28x1029.25''11.25''26.75'' - 28.5''8.75'' - 10.5''1.16459.8%
28x1229.25''13.25''26.75'' - 28.5''10.75'' - 12.5''1.44361.8%
28x1429.25''15.25''26.75'' - 28.5''12.75'' - 14.5''1.72363.3%
28x1629.25''17.25''26.75'' - 28.5''14.75'' - 16.5''2.00264.4%
28x1829.25''19.25''26.75'' - 28.5''16.75'' - 18.5''2.28265.2%
28x2029.25''21.25''26.75'' - 28.5''18.75'' - 20.5''2.56165.9%
28x2229.25''23.25''26.75'' - 28.5''20.75'' - 22.5''2.84166.4%
28x2429.25''25.25''26.75'' - 28.5''22.75'' - 24.5''3.12066.9%
28x2529.25''26.25''26.75'' - 28.5''23.75'' - 25.5''3.26067.1%
28x2629.25''27.25''26.75'' - 28.5''24.75'' - 26.5''3.40067.2%
28x2829.25''29.25''26.75'' - 28.5''26.75'' - 28.5''3.67967.6%
28x3029.25''31.25''26.75'' - 28.5''28.75'' - 30.5''3.95967.9%
28x3229.25''33.25''26.75'' - 28.5''30.75'' - 32.5''4.23868.1%
28x3429.25''35.25''26.75'' - 28.5''32.75'' - 34.5''4.51868.3%
28x3629.25''37.25''26.75'' - 28.5''34.75'' - 36.5''4.79768.5%
30x0831.25''9.25''28.75'' - 30.5''6.75'' - 8.5''0.95057.0%
30x1031.25''11.25''28.75'' - 30.5''8.75'' - 10.5''1.25060.0%
30x1231.25''13.25''28.75'' - 30.5''10.75'' - 12.5''1.55162.0%
30x1431.25''15.25''28.75'' - 30.5''12.75'' - 14.5''1.85163.5%
30x1631.25''17.25''28.75'' - 30.5''14.75'' - 16.5''2.15164.5%
30x1831.25''19.25''28.75'' - 30.5''16.75'' - 18.5''2.45265.4%
30x2031.25''21.25''28.75'' - 30.5''18.75'' - 20.5''2.75266.1%
30x2231.25''23.25''28.75'' - 30.5''20.75'' - 22.5''3.05366.6%
30x2431.25''25.25''28.75'' - 30.5''22.75'' - 24.5''3.35367.1%
30x2531.25''26.25''28.75'' - 30.5''23.75'' - 25.5''3.50367.3%
30x2631.25''27.25''28.75'' - 30.5''24.75'' - 26.5''3.65367.4%
30x2831.25''29.25''28.75'' - 30.5''26.75'' - 28.5''3.95467.8%
30x3031.25''31.25''28.75'' - 30.5''28.75'' - 30.5''4.25468.1%
32x0833.25''9.25''30.75'' - 32.5''6.75'' - 8.5''0.99846.7%
32x1033.25''11.25''30.75'' - 32.5''8.75'' - 10.5''1.31350.5%
32x1233.25''13.25''30.75'' - 32.5''10.75'' - 12.5''1.62853.2%
32x1433.25''15.25''30.75'' - 32.5''12.75'' - 14.5''1.94355.2%
32x1633.25''17.25''30.75'' - 32.5''14.75'' - 16.5''2.25856.7%
32x1833.25''19.25''30.75'' - 32.5''16.75'' - 18.5''2.57357.9%
32x2033.25''21.25''30.75'' - 32.5''18.75'' - 20.5''2.88858.9%
34x0835.25''9.25''32.75'' - 34.5''6.75'' - 8.5''1.06447.0%
34x1035.25''11.25''32.75'' - 34.5''8.75'' - 10.5''1.40050.8%
34x1235.25''13.25''32.75'' - 34.5''10.75'' - 12.5''1.73653.5%
34x1435.25''15.25''32.75'' - 34.5''12.75'' - 14.5''2.07255.5%
34x1635.25''17.25''32.75'' - 34.5''14.75'' - 16.5''2.40857.0%
34x1835.25''19.25''32.75'' - 34.5''16.75'' - 18.5''2.74358.2%
34x2035.25''21.25''32.75'' - 34.5''18.75'' - 20.5''3.07959.2%
30x0837.25''9.25''34.75'' - 36.5''3.75'' - 8.5''1.13047.2%
36x1037.25''11.25''34.75'' - 36.5''8.75'' - 10.5''1.48751.1%
36x1237.25''13.25''34.75'' - 36.5''10.75'' - 12.5''1.84353.8%
36x1437.25''15.25''34.75'' - 36.5''12.75'' - 14.5''2.20055.8%
36x1637.25''17.25''34.75'' - 36.5''14.75'' - 16.5''2.55757.3%
36x1837.25''19.25''34.75'' - 36.5''16.75'' - 18.5''2.91458.5%
36x2037.25''21.25''34.75'' - 36.5''18.75'' - 20.5''3.27059.5%