Table 2. Furnace Airflow Data
| Heating |
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| External Static Pressure (Inches Water Column) |
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Model | Input | Motor | Motor |
| 0.1 | 0.2 |
| 0.3 | 0.4 |
| 0.5 |
| 0.6 |
| 0.7 |
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| 0.8 | |||||||||
Number | (Btuh) | Speed | HP | CFM |
| Rise | CFM |
| Rise | CFM |
| Rise | CFM |
| Rise | CFM |
| Rise | CFM |
| Rise | CFM |
| Rise | CFM |
| Rise |
|
| High* |
| 1620 |
| - | 1560 |
| 45 | 1490 |
| 47 | 1430 |
| 49 | 1365 |
| 52 | 1300 |
| 54 | 1240 |
| 57 | 1170 |
| 60 |
80,000 | 1/2 | 1450 |
| 49 | 1400 |
| 50 | 1350 |
| 52 | 1295 |
| 54 | 1240 |
| 57 | 1180 |
| 60 | 1120 |
| 63 | 1060 |
| 66 | ||
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| 1255 |
| 56 | 1225 |
| 57 | 1180 |
| 60 | 1145 |
| 61 | 1105 |
| 64 | 1060 |
| 66 | 1020 |
| 69 | 980 |
| 72 | |
|
| Low |
| 1080 |
| 65 | 1055 |
| 67 | 1030 |
| 68 | 1000 |
| 70 | 960 |
| 73 | 920 |
| - | 870 |
| - | 820 |
| - |
|
| High* |
| 1620 |
| 54 | 1555 |
| 57 | 1485 |
| 59 | 1425 |
| 62 | 1355 |
| 65 | 1290 |
| 68 | 1220 |
| 72 | 1160 |
| - |
100,000 | 1/2 | 1430 |
| 62 | 1375 |
| 64 | 1330 |
| 66 | 1265 |
| 70 | 1210 |
| 73 | 1150 |
| - | 1080 |
| - | 1010 |
| - | ||
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| 1260 |
| 70 | 1220 |
| 72 | 1170 |
| 75 | 1130 |
| - | 1070 |
| - | 1010 |
| - | 950 |
| - | 890 |
| - | |
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| Low |
| 1085 |
| - | 1050 |
| - | 1015 |
| - | 970 |
| - | 935 |
| - | 890 |
| - | 850 |
| - | 800 |
| - |
|
| High* |
| 1700 |
| 62 | 1635 |
| 65 | 1565 |
| 67 | 1500 |
| 70 | 1435 |
| 74 | 1370 |
| 77 | 1310 |
| - | 1240 |
| - |
120,000 | 1/2 | 1510 |
| 70 | 1455 |
| 73 | 1405 |
| 75 | 1350 |
| 78 | 1290 |
| - | 1230 |
| - | 1170 |
| - | 1100 |
| - | ||
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| 1330 |
| 79 | 1280 |
| - | 1240 |
| - | 1195 |
| - | 1145 |
| - | 1100 |
| - | 1050 |
| - | 1000 |
| - | |
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| Low |
| 1140 |
| - | 1110 |
| - | 1075 |
| - | 1040 |
| - | 1010 |
| - | 980 |
| - | 940 |
| - | 910 |
| - |
|
| High* |
| 2140 |
| - | 2070 |
| - | 2010 |
| - | 1945 |
| - | 1870 |
| 56 | 1800 |
| 59 | 1730 |
| 61 | 1650 |
| 64 |
120,000 | 3/4 | 1955 |
| - | 1900 |
| 56 | 1850 |
| 57 | 1800 |
| 59 | 1740 |
| 61 | 1690 |
| 62 | 1630 |
| 65 | 1570 |
| 67 | ||
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| 1660 |
| 64 | 1620 |
| 65 | 1575 |
| 67 | 1540 |
| 69 | 1495 |
| 71 | 1460 |
| 72 | 1410 |
| 75 | 1370 |
| 77 | |
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| Low |
| 1450 |
| 73 | 1430 |
| 74 | 1400 |
| 75 | 1360 |
| 78 | 1340 |
| 79 | 1300 |
| 81 | 1270 |
| 83 | 1230 |
| - |
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| High* |
| 1280 |
| - | 1210 |
| - | 1180 |
| - | 1140 |
| - | 1090 |
| - | 1070 |
| - | 1030 |
| - | 990 |
| - |
40,000 | Medium | 1/3 | 1140 |
| - | 1090 |
| - | 1060 |
| - | 1030 |
| - | 980 |
| 35 | 950 |
| 36 | 910 |
| 37 | 870 |
| 39 | |
|
| Low** |
| 875 |
| 39 | 835 |
| 41 | 820 |
| 41 | 805 |
| 42 | 780 |
| 43 | 770 |
| 44 | 760 |
| 45 | 750 |
| 45 |
|
| High* |
| 1260 |
| 40 | 1190 |
| 43 | 1155 |
| 44 | 1120 |
| 45 | 1075 |
| 47 | 1030 |
| 49 | 980 |
| 52 | 940 |
| 54 |
60,000 | Medium | 1/3 | 1120 |
| 45 | 1070 |
| 48 | 1040 |
| 49 | 1010 |
| 50 | 960 |
| 53 | 930 |
| 55 | 890 |
| 57 | 850 |
| 60 | |
|
| Low** |
| 855 |
| 59 | 815 |
| 62 | 800 |
| 64 | 780 |
| 65 | 760 |
| 67 | 730 |
| 70 | 710 |
| - | 690 |
| - |
|
| High* |
| 1635 |
| - | 1585 |
| - | 1525 |
| - | 1460 |
| 46 | 1400 |
| 48 | 1330 |
| 51 | 1260 |
| 54 | 1180 |
| 57 |
80,000 | 1/2 | 1435 |
| 47 | 1395 |
| 49 | 1350 |
| 50 | 1300 |
| 52 | 1255 |
| 54 | 1200 |
| 56 | 1150 |
| 59 | 1090 |
| 62 | ||
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| 1230 |
| 55 | 1200 |
| 56 | 1165 |
| 58 | 1130 |
| 60 | 1090 |
| 62 | 1050 |
| 65 | 1000 |
| 68 | 960 |
| 71 | |
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| Low |
| 1050 |
| - | 1035 |
| - | 1010 |
| - | 980 |
| - | 950 |
| - | 910 |
| - | 870 |
| - | 820 |
| - |
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| High* |
| 1600 |
| 53 | 1555 |
| 54 | 1500 |
| 56 | 1445 |
| 59 | 1380 |
| 61 | 1310 |
| 65 | 1240 |
| 68 | 1160 |
| 73 |
100,000 | 1/2 | 1475 |
| 57 | 1435 |
| 59 | 1385 |
| 61 | 1335 |
| 63 | 1290 |
| 66 | 1240 |
| 68 | 1190 |
| 71 | 1130 |
| 75 | ||
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| 1320 |
| - | 1290 |
| - | 1250 |
| - | 1215 |
| - | 1170 |
| - | 1120 |
| - | 1070 |
| - | 1020 |
| - | |
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| Low |
| 1150 |
| - | 1130 |
| - | 1110 |
| - | 1075 |
| - | 1040 |
| - | 1000 |
| - | 950 |
| - | 890 |
| - |
** Factory Set Cooling Speed | NOTES: 1. Airflow rates of 1800 CFM or more require two return air connections. Data is for operation with filter(s). | |
** Factory Set Heating Speed | 2. | Temperature rises in the table are approximate. Actual temperature rises may vary. |
- Not Recommended | 3. | Temperature rises and airflows for external static pressures greater than 0.5 are for reference only. |
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| These conditions are not recommended. |
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