SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: N9MSB
Specifications subject to change without notice.
14 440 04 4413 03
Table 5 COOLING AIR DELIVERY - CFM (with filter
1
)
SIZE
RETURN AIR
CONNECTION
WIRE
LEAD
COLOR
COOL-
ING
TONS
CFM
/TON
TEST AIRFLOW DELIVERY @ VARIOUS EXTERNAL STATIC PRESSURES
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
401410 SIDE/BOTTOM
Black 2.5 388 1145 1100 1060 1015 970 920 860 785 680 615
Blue 2.0 413 970 940 905 870 825 775 730 675 570 505
Yellow 2.0 385 910 880 845 810 770 725 675 600 535 475
Red 1.5 397 725 695 665 635 595 555 510 460 390 340
401712 SIDE/BOTTOM
Black 3.0 380 1365 1310 1255 1200 1140 1080 1015 950 860 795
Yellow 2.5 418 1245 1200 1150 1100 1045 990 930 855 790 730
Orange 2.5 366 1050 1025 985 950 915 870 820 760 705 655
Blue 2.0 435 980 955 935 905 870 830 780 725 675 625
Red 1.5 437 720 705 690 675 655 625 590 555 525 485
601412 SIDE/BOTTOM
Black 3.0 385 1215 1205 1205 1195 1155 1100 1045 975 910 805
Blue 2.5 370 980 985 980 955 925 880 835 780 695 585
Yellow 2.0 425 910 920 905 880 850 815 765 695 630 545
Red
3
1.5 430 750 730 705 680 645 605 555 490 435 370
601716 SIDE/BOTTOM
Black 4.0 376 1600 1545 1505 1475 1505 1445 1400 1330 1235 1140
Yellow 3.5 377 1380 1340 1335 1330 1320 1285 1225 1155 1085 1000
Blue
3
3.0 387 1190 1185 1195 1195 1160 1125 1075 1015 950 885
Red
3
2.5 394 1030 1025 1030 1010 985 940 905 855 805 735
801716 SIDE/BOTTOM
Black 4.0 408 1800 1770 1735 1685 1630 1570 1495 1415 1330 1230
Yellow 3.5 386 1445 1430 1410 1385 1350 1305 1255 1195 1120 1045
Orange 3.0 390 1250 1240 1225 1200 1170 1130 1090 1040 975 910
Blue 2.5 404 1090 1080 1060 1035 1010 970 930 885 835 765
Red
3
2.0 390 880 860 835 810 780 750 710 665 615 560
802120
BOTTOM or
TWO−SIDES
4,5
Black 5.0 377 2225 2160 2070 1980 1885 1790 1690 1575 1460 1345
Yellow 4.0 386 1690 1665 1640 1595 1545 1485 1410 1330 1235 1135
Orange 3.5 397 1485 1470 1455 1430 1390 1340 1280 1205 1120 1035
Blue
3
2.5 426 1120 1110 1100 1090 1065 1035 990 935 870 805
Red
3
2.0 433 940 920 910 890 865 830 790 745 690 625
1002116 SIDE/BOTTOM
Black 4.0 373 1715 1660 1610 1555 1490 1420 1340 1245 1150 1065
Yellow
3
3.5 379 1535 1480 1435 1380 1325 1260 1180 1095 1010 910
Blue
3
3.0 367 1300 1255 1205 1160 1100 1035 970 905 810 730
Red
3
2.0 445 1110 1055 1005 955 890 835 770 690 610 535
1002120
BOTTOM or
TWO−SIDES
4,5
Black 5.0 394 2270 2205 2130 2055 1970 1880 1780 1670 1555 1425
Yellow 5.0 367 2090 2040 1980 1910 1835 1755 1670 1570 1460 1340
Blue 4.0 416 1850 1815 1775 1725 1665 1600 1525 1435 1335 1225
Red 3.5 421 1580 1550 1540 1515 1475 1420 1355 1280 1190 1100
1202420
BOTTOM or
TWO−SIDES
4,5
Black 5.0 410 2385 2310 2230 2150 2050 1920 1780 1650 1540 1415
Yellow 5.0 369 2130 2070 2010 1940 1845 1740 1630 1525 1420 1305
Blue 4.0 416 1875 1840 1795 1735 1665 1580 1495 1410 1310 1205
Red
3
3.5 414 1610 1585 1555 1515 1450 1395 1325 1250 1160 1080
NOTES:
1. A filter is required for each return−air inlet. Airflow performance includes a 3/4 in. (19 mm) washable filter media such as contained in factory−
authorized accessory filter rack. See accessory list. To determine airflow performance without this filter, assume an additional 0.1 in. W.C.
available external static pressure.
2. ADJUST THE BLOWER SPEED TAPS AS NECESSARY FOR THE PROPER AIR TEMPERATURE RISE FOR EACH INSTALLATION.
3. Shaded areas indicate that this airflow range is BELOW THE RANGE ALLOWED FOR HEATING OPERATION. THESE AIRFLOW RANGES
MAY ONLY BE USED FOR COOLING.
4. Airflows over 1800 CFM require bottom return, two−side return, or bottom and side return. A minimum filter size of 20” x 25” is required.
5. For upflow applications, air entering from one side into both the side of the furnace and a return air base counts as a side and bottom return.
6. All airflows that are shown in BOLD exceed 0.58 Watts per CFM at the given external static pressure.
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