Specification Sheet

455
PERFORMANCE DATA
Relief
Throat
Area
Ft
2
.030 .060 .090 .125 .150 .200 .250 .300
BDD
O.D Sq.
(RCXII)
Prefab Curb
Recom. O.D
(RCXII)
24 3.30 1535 2168 2656 3128 3429 3960 4425 4851 26 33-3/4
26 3.69 1716 2424 2970 3498 3834 4428 4948 5424 26 33-3/4
30 5.16 2399 3390 4154 4892 5361 6192 6920 7585 32 40-3/4
33 5.94 2762 3903 4782 5631 6172 7128 7966 8732 32 40-3/4
36 7.06 3283 4638 5683 6693 7335 8472 9467 10378 32 40-3/4
Intake
Throat
Area Ft
2
.030 .060 .090 .125 .150 .200 .250 .300
BDD
O.D Sq.
(RCXII)
Prefab Curb
Recom. O.D
(RCXII)
24 3.30 1376 1944 2383 2808 3076 3551 3969 4346 26 33-3/4
26 3.69 1539 2173 2664 3140 3439 3970 4439 4860 26 33-3/4
30 5.16 2152 3039 3726 4391 4809 5552 6207 6796 32 40-3/4
33 5.94 2476 3499 4289 5055 5536 6391 7146 7823 32 40-3/4
36 7.06 2944 4158 5097 6008 6580 7597 8493 9298 32 40-3/4
Bold selections are over recommended 650 FPM. Pick next larger size or use optional weather screen.
Insect Screens - Add .10 to area shown in table.
Damper - Add .10 to area shown in table.
Relief
Throat
Area
Ft
2
.025 .050 .100 .125 .150 .200 .250 .300 .350
BDD O.D
Sq.
(RCXII)
Prefab Curb
Recom. O.D
(RCXII)
6 0.3 93 131 185 207 227 262 293 320 346 8 14-3/4
8 0.4 221 313 442 494 541 625 699 766 827 8 14-3/4
10 0.7 297 420 594 664 727 840 939 1029 1111 12 22-1/4
12 0.9 493 697 986 1102 1208 1394 1559 1708 1845 12 22-1/4
14 1.2 604 853 1207 1349 1478 1707 1908 2091 2258 12 22-1/4
16 1.6 746 1055 1492 1668 1827 2110 2359 2584 2791 12 22-1/4
18 2.0 919 1300 1838 2055 2251 2599 2906 3184 3439 20 27-3/4
20 2.4 1127 1593 2253 2519 2759 3186 3562 3902 4215 20 27-3/4
Intake
Throat
Area
Ft
2
.025 .050 .100 .125 .150 .200 .250 .300 .350
BDD
O.D Sq.
(RCXCII)
Prefab Curb
Recom. O.D
(RCXII)
6 0.3 64 91 128 143 157 181 202 222 239 8 14-3/4
8 0.4 148 209 296 331 363 419 468 513 554 8 14-3/4
10 0.7 202 286 404 452 495 571 639 700 756 12 22-1/4
12 0.9 330.5 467 661 739 810 935 1045 1145 1237 12 22-1/4
14 1.2 440.5 623 881 985 1079 1246 1393 1526 1648 12 22-1/4
16 1.6 552 781 1104 1234 1352 1561 1746 1912 2065 12 22-1/4
18 2.0 707.5 1001 1415 1582 1733 2001 2237 2451 2647 20 27-3/4
20 2.4 856 1211 1712 1914 2097 2421 2707 2965 3203 20 27-3/4
Model RCXII (sizes 24-36)
Models RCXII (sizes 6-20) and Models RCXII-SF
Insect Screens - Add .10 to area shown in table.
Damper - Add .10 to area shown in table.
Refer to page 420 for formulas for help in sizing.
MODELS RCXII/RCXII-SF
RELIEF/INTAKE GRAVITY VENTILATORS