SERVICE AND TECHNICAL SUPPORT MANUAL
Gas Furnace: (F/G)9MXE
Specifications subject to change without notice.
12
440 04 4311 08
Table 5
COOLING AIR DELIVERY - CFM (With Filter
1
)
UNIT
SIZE
RETURN-AIR
CONNECTION
SPEED
TAPS
2,3
EXTERNAL STATIC PRESSURE (IN.W.C.)
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
0401410
SIDE/BOTTOM
Gray
1120
1080
1030
980
925
875
820
760
690
630
Yellow
880
845
810
780
740
710
680
640
615
570
Blue
695
665
620
575
535
495
455
420
370
280
Orange
640
595
540
495
460
420
370
310
260
230
Red
570
525
475
425
385
330
255
220
-
6
-
6
0401712
SIDE/BOTTOM
Gray
1255
1220
1175
1130
1085
1040
990
940
880
825
Yellow
940
905
870
840
805
770
735
695
665
630
Blue
705
670
630
575
540
500
455
410
380
325
Orange
580
535
480
425
380
335
290
235
-
6
-
6
Red
555
485
425
375
330
280
215
-
6
-
6
-
6
0601412
SIDE/BOTTOM
Gray
1265
1225
1185
1140
1090
1030
975
920
850
760
Yellow
1115
1085
1060
1030
1000
970
930
880
810
715
Orange
1000
970
940
910
880
845
815
770
735
695
Blue
945
915
885
855
820
785
745
705
675
635
Red
770
740
700
660
620
575
540
500
455
415
0601714
SIDE/BOTTOM
Gray
1720
1670
1620
1565
1505
1440
1375
1295
1220
1135
Yellow
1325
1285
1255
1220
1185
1145
1115
1075
1040
1000
Blue
1010
970
925
875
835
785
745
690
660
620
Orange
1160
1115
1080
1045
1000
960
920
875
840
785
Red
785
715
655
595
530
490
435
385
340
285
0801716
SIDE/BOTTOM
Gray
1810
1770
1720
1665
1610
1540
1475
1400
1315
1235
Yellow
1535
1500
1475
1435
1405
1370
1340
1310
1245
1160
Blue
1380
1340
1305
1270
1240
1200
1165
1130
1090
1050
Orange
1180
1130
1095
1060
1015
975
935
895
850
800
Red
1100
1045
1010
970
920
885
845
790
745
690
0802120
BOTTOM or
TWO-SIDES
4, 5
Gray
2290
2225
2155
2090
2015
1930
1845
1750
1640
1515
Yellow
1810
1760
1725
1685
1640
1600
1555
1520
1480
1415
Blue
1385
1340
1285
1240
1200
1140
1090
1050
995
950
Orange
1560
1520
1475
1430
1385
1335
1295
1240
1200
1150
Red
1055
985
910
860
795
750
680
615
565
495
1002120
BOTTOM or
TWO-SIDES
4, 5
Gray
2340
2295
2250
2195
2110
2030
1935
1835
1725
1605
Yellow
1950
1900
1855
1800
1755
1705
1655
1605
1560
1485
Blue
1750
1700
1650
1605
1555
1500
1455
1395
1350
1300
Orange
1570
1520
1460
1410
1350
1300
1240
1195
1140
1095
Red
1350
1280
1225
1155
1105
1045
1000
950
895
830
1202422
BOTTOM or
TWO-SIDES
4, 5
Gray
2275
2230
2185
2130
2055
1950
1825
1710
1610
1500
Yellow
1875
1820
1770
1720
1660
1600
1550
1505
1450
1390
Blue
2170
2125
2075
2025
1975
1900
1790
1695
1590
1470
Orange
3
1475
1420
1350
1280
1215
1165
1105
1050
995
930
Red
3
1625
1565
1505
1445
1385
1325
1275
1225
1170
1130
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
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. The ”
−
” entry indicates an unstable operating condition.