6
AIR DELIVERY -- CFM (BOTTOM RETURN WITH FILTER)
Furnace
Return Air
Connection
Wire Lead
Color
Cooling
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
030040
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
036060
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
036040
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
048060
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
048080
SIDE/BOTTOM
Black
4.0
389 1650 1620 1640 1605 1555 1495 1425 1345 1255 1165
Yellow
3.5
381 1420 1425 1400 1370 1335 1290 1230 1170 1095 1015
Orange
3.0
383 1205 1205 1185 1165 1150 1100 1055 1000
935
870
Blue
2.5
384 1035 1020 1005
985
960
930
895
845
795
735
Red
2.0
380
850
825
805
785
760
725
695
655
600
545
060080
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
048100
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
060100
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
060120
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
NOTE
:
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 a factory---author-
ized 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.
4. Airflows over 1800 CFM require bottom return, two---side return, or bottom and side return. A minimum filter size of 20” x 25” (508 x 635 mm) 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.
912SC
